• Koszyk jest pusty
  • x
Do bezpłatnej dostawy brakuje -,--
Darmowa dostawa!
Suma 0,00 zł
Cena uwzględnia rabaty
Szukaj
0,00 zł
0
  • Koszyk jest pusty
  • x
Do bezpłatnej dostawy brakuje -,--
Darmowa dostawa!
Suma 0,00 zł
Cena uwzględnia rabaty

  • Kalkulator Casio SL-310UC biały

Kalkulator Casio SL-310UC biały Kalkulator Casio SL-310UC biały
Symbol: X17037
51.00
szt. Do przechowalni
Wysyłka w ciągu 24 godziny
Cena przesyłki 0
Kurier (Pobranie) 0
Odbiór osobisty 0
Paczkomaty InPost 12
Poczta Polska 15
Poczta Polska (Pobranie) 20
Kurier 35
Dostępność Mało
Waga 0.15 kg

Zamówienie telefoniczne: 663898980

Zostaw telefon
  • Opis
  • Parametry
  • Opinie i oceny (0)
  • Zadaj pytanie
Symbol dostawcy:
^ SL-310UC-WE
Kolor:
Biały
Nie ma jeszcze komentarzy ani ocen dla tego produktu.
Podpis
E-mail
Zadaj pytanie
  • Producenci
2flexi
2x3
3L
3M
3mk
A&G KOPERTY
ABARTH
Abena
ABYstyle
AC MILAN
Ace
Action Force
Active Air
ACTONA
Adam Toys
Addis
ADIDAS
Adler
Adragna
ADRIATIC
AF
AG Kuchenki
AG WIELICZKA
Agnawoolart IGiZ - ul. T. Komorowskiego 10/36 63-100 Śrem,
Agrecol
Ahmad Tea
AiG
AIR WICK
Air-Val International,S.A.
Airpure
AJAX
Ajregniers
AKSJOMAT
AKU Sp. z o.o.
Aladine - Francja
Aladine Francja
ALBATROSS
AlcoDigital
Aldente GmbH
Aldi
Alex Sweets B.V.
Alexander
Alfi
Alio
All Ride
Alligator
Alpia
Alpina
Altto
Amax
Amazonas
Amazonas1
Ambi Pur
AMBIANCE LIGHT
Amelie
AMERSAFE
Amos
AMT
Amtra Sp.z o.o.
AMW
AMZ
Andropol
ANGEL
Angry Birds
Anlily
ANNA ZARADNA
Anthon Berg
ANTIVIRUS
Antonio Juan
ANZONA
APEX
Apli
Appel Feinkost GmbH&Co KG
Aptex
AQUAJET
ARCO DESIGN
Arcos
Argo
Ariel
Arix
Ark
Arola
Aroma Smak
Arquivet
Arquivet Fresh
ART-POL
Arti Casa
ArtiCasa
Artico
Artifact
ArtistCo
Asia Gold
ASORTYMENT
Astonish
AUDI
AURA
Avantis
Avengers
AVENLI
Avery Zweckform
AVT
Azjatycki Styl
Babell
Baby Anthyllis
Baby Bites
Baby Gadgets
Baby Great
BabyMatex
Back Family
Balea
BALJA
Balto
Bamp
BANKERS BOX
Bantex
Banwood
BARBARA
BARBO TOYS
BarboToys
BARCELONA
Barka Home
Barkitos
Baronet GMBH
BASEUS
Batman
BAYERN MUNCHEN
BBQ
BBQ LINE
Beautylushh
Bebico
Beckys
Beiersdorf
BENCHK
Beppe
Bertoni
BEST SPORTING
BESTWAY
Betesca
Bettina Barty
Bewood
Bez marki
BFT
Bgtech
Bi-Office
Bic
BICYCLE GEAR
BIG-ACTIVE
BIGO
Bigstren
Bimbo
Bino
Bio-D
BISPOL
BISSET
Biurfol
BJ Plastik
BKF
BLACK + DECKER
Black&Decker
BLUE DOLPHIN
Bluesun
Bluesun Consumer Brands
BMW
Bo Camp
Böhme
Bolton Manitoba S.p.A
Bopon
Borofone
BRADAS
Brainstorm
Brak
Brandmac
Brands
Brandt Walther GMBH
BranQ
Braun Oral- B
Brennenstuhl
Bright Starts
Brilly
BROS
Bros Sp. z o.o.
BRUTE
Bryza
BT21
Bübchen
Budi
Built
BulkySoft
BULT
BUMBLERIDE
Burnus
Burnus D-Darmstadt
BUROMAX
Buzzy
Cadac
CADBURY
CALGON
CAMP ACTIVE
CAMRY
Canun
Canun Premium
Capri-Sun
Carbotex
CARIOCA
Carl Kühne
Carr&Day&Martin
Cars
Casali
Case-mate
Caseology
Casio
CASSMEDIA
Castorland
CasusGrill
Catalyst
CATS COLLECTION
Cawoe
Cegeco
Cellularline
CEP
Cernit
CERVA
Charlie Crane
Chateau
Cherry Blossom
Childhome
Chłopcy z Rancza
Choceur
Chocholarnia
Chomik
CHRISTMAS DECORATION
Christmas Gifts
ChRLD
Chupa Chups
Ciccarelli
CIF
CILLIT
CILLIT BANG
Cisowianka
Citizen
Clairefontaine - Francja
CLAIREFONTAINE RHODIA RD 52 - 68490 Ottmarsheim | France
Clarysse
Cleanright
Clementoni
Clics & Clicformers
Clin
Clinex
Cliver
Clixo
Cloetta
Clovin Germany GmbH
COCA COLA
COCCOLINO
Colani
Coldpack
Colgate- Palmolive
COLOR COPY
Colorvelvet
Colorvelvet - Włochy
Combo
COMFY
COMMAND
Connabride
Conter
Continental Bakeries
Cool Bottles
Coolcam
Coppenrath
Correto
CORRETTO
Corsair
CORVINA
Coty
Craft
Creativ - Dania
Creativ Company R Færchs Vej 23 7500 Holstebro DK
Creative Kids
CREMONA
Croen Hypo
Crong
CS ENTERTAINMENT GROUP
Cuisine Elegance
CURVER
Cussons
Cut Cut Cut Francja
D2.DESIGN
Dahle
Dalli - Werke
Dallmayr
DALPO
Daniel Wellington
Darchem Cosmetics
Darwi - Belgia
Darwi Belgia
Darymex
Davidoff
Deb
DELIKATO
Delta pronatura
Delu Ako Minky GmbH
DERFORM
Design 91
Detal
Detexpol
Deutsche SiSi-Werke Betriebs GmbH
DEWALT
Dexter & Waddle
Dextro Energy GmbH & Co. KG
Diamant
Diamentiq
DIESEL
Dilmah
DIPLOMAT
Dirt Devil
Dishmatic
Disney
DiVinto
Divinus
DIZONA
DK
Dm-drogerie markt
Dm-drogerie markt GmbH + Co. KG
DOGS COLLECTION
DOLINA NOTECI
Domarex
Domestos
Dometic
Domino
Don Fernando
Donau
Donau Tech
Donnay
Dontodent
DorTech
Double Horse
Douwe Egberts
DOVE
Dr GERARD
Dr liebe
Drammock International
DU-BRO
Dunlop
Dunmoon
Duotex
Durable
Duzzit
Dymo
Eagle
Easy
Easy life Mako
EB FIT
ECKO
Eco By Naty
EcoDenta
Ecover
EDA
Edding
Eddy toys
Edeka
EDELMAN
Edgard
EE
Eickmeyer&Gehring
EkoDarPol
Elba
Elbow Grease
Element Case
Ellis
Elmer's
Emerson
Emily
Emoji
EMPORIO ARMANI
Energizer
ENERO
ENERO CAMP
ENERO FIT
ENERO PRO
ENERO TOYS
Entelo
Epee
Erdal Rex
Erdal-Rex GmbH
ERIMA
ERS - zabawki
Esperanza
Esselte
EStonia
EStonia Collection D,art
ETIGER
Eurofirany
Europe Distribution Group Sp. z o.o.
EUROPE100
Euroswan
EUROTAPE
EVA MINGE
Eveready
Evoque
Evorei
EXCELLENT HOUSEWERE
Excelsior
EXO
EXPEL
Extrapościel
EzzyGroom
Fa
Faber-Castell
Fabryka Kart Trefl
Fairtrade
FAIRY
Faith In Nature Ltd.
Familia
Fampur
Fandy
FANTA
Faro
FAST ORANGE
Fazer
FC BARCELONA
FEHN
Feiny Biscuits
Felce Azzurra
FELIX
Fellowes
Ferrero
FHS
Fiboo
Figl
Filibabba
FINISH
FIORELLO
FISH ACTIVE
Fisher-Price
Fissler
Fit GMBH
Force
Forcetop
FOX 40
FOXY
Fresco
Fresh & Cold
FRESH&COLD
FRESK
Friends
Friesland
Frosch
Froster
Frozen
Fruit of The Loom
G.Rossi
G&G
Gaba
Gadget Factory
Gadget Master
Gadget-Master
Galeria Papieru
Galletas Gullón
Gallon
Gamdias
Game of Thrones
GARDEN LIFE
Gardena
Gardenplast
Gardlov
Garnier
Gatar Trading UG
Gefu
General Fresh
Genuport Trade GmbH
GERTU
Gevalia
GF Agro
Giewont
GiftWorld
Gimboo
Gina
Glade
GLADE by BRISE
GlaxoSmithKline
Glencoe Models
Global Cosmed Group S.A.
GM
GMP
Goki
Gold Drop
Gold Drop Sp.z o.o
Golden Pet Food
Goliath
Gonpa
GOODRAM
GoodYear
GOPLANA
Gostyń
GP
GPX Extreme
Graine Creative - Francja
Graine Creative Francja
GRAINE CREATIVE ZAE Le Rond CS 70031 37290 PREUILLY SUR CLAISE
Grand
GRAPHITE
Gravity
Gre
Great Planes
Green
Green Cell
Green Shield
Green-A
GREENTOM
Greenyard
Greno
Griesson-debeukelaer
Griffin
Grundig
Grupa Inco S.A.
GUESS
Guhl
Guillows
Gullon
Gunz
GUNZ - Fine european food
Hailea
Hakle
Halantex
HAN
Hape
Happet
HAPPS
Happy Color
HappyHop
HappyOne
HappyOne Meditteraneum
Haribo
Haribo GmbH & Co. KG
Harper Hygienics S.A.
Harry Potter
Hasbro
Hearts
Heinerle
Heitmann
Hela
Hello Kitty
Hellux
Henkel
Herbapol
Herding
Herlitz
HERO
Hesperide
Hilton
Hipp
Hobby
Hobby Model
Hola
Holi Cow
Home & Styling Collection
HOMEFITNESS SPÓŁKA Z OGRANICZONĄ
HONEYWELL
Horeca
HORSE
Hosta
HP
HSP
Hudora
Huggies
Hugo Boss
Huile Toys
Ico
Igepa
IGrip
Imax
Import SUPER-TOYS
Incase
Incastro
Incipio
INNA
Inne
Inny
Integral
Intenso
Inter Widex
Interbaby
INTERDRUK
Intersnack
Intesi
Invented 4 Kids
Invicta
Ipicasso
Irya Tekstil
Iso Trade
Isostar
ITSEPTIC
Ivanka
Izoxis
J.J Darboven
Jacobs
Jacobs Douwe Egberts HQ
Jacobsen Bakery Ltd.
Jakemy
JAN NIEZBĘDNY
Janod
Jawa
JDE
Jeden Tag
Jerry Fabrics
JILONG
Jixin
John Player
Joker
JOKOMISIADA
JOMA
Jonhson & Johnson
JOOLA
JORDAN KERR
Julius Meinl
Jumpi
JURAV
Just Mobile
Jutrzenka
JUVENTUS
K
K-Classic
Kaba
Kaiser
Kamai
Kamai Cadac
Kamai Christmas Decorations
Kamai Coolbox
Kamai Gio Style
Kamai Ordinett
Kamai Royal
Kamai SimplyCan
Kamai Stojaki Choinkowe
Kaminer
Kamix
Kampol
Kanex
Kapitan Ameryka
Kapitan Nauka
KARL LAGERFELD
Karna Home
KARO
Kate Spade New York
Katjes Fassin GmbH
KATRIN
Katrus
Kazeto
Kensington
Keter
Keter Lighting
Kettler
KEYROAD
Kimbo S.p.A.
Kingston
Kinkartz
Kinzo
KISTENBERG
KITEKAT
Klareko
KLEVER
Klocki.edu.pl
Knusperone
Kodak
Koobi
KOOPMAN
Korbo
Koziol
KRAKUSKI
KRET
Kropla Beskidu
Krüger
Krüger GmbH & Co. KG
Krusell
Kruzzel
Kubuś Puchatek
Kum
Kunagone
Kursor Multimedia
L'Oreal
La Pajarita - Hiszpania
LACO
Lajkonik
Lakma
Lamagik Magic Baby
LAMANUEL
Lambertz
Lambo
Lamix
Lassig
Laut
Lavatelli
Lavazza
Le Gusto
LEANToys
Learning Resources
Legend
LEGO
Leitz
Leniar
Lenor
Lenora
Lenovo
Leonardo
Let's Play
LETTURA
Lexar
Licencja Disney
Lifetime
LIFETIME GAMES
Light&Living
Lilliputiens
Limasso
Lindberg
Line Friends
LINEX
Lipton
Lirene
Little Architect
LITTLE DOCTOR
Litty Kitty
Llorens
LOL Surprise
Loowi
Lorenay
Lornamead GmbH
Lotusbiscoff
Lovela
Lucy & Leo
Ludus
Ludwig Schokolade GmbH & Co. KG
LUDWIK
Lugano
LUKSJA
LULA
Luna
LUXLASHES
Luxma
Luxury
Łaciate
Maaleo
Made2Protect
Maduu Studio
MAESTRO
MAESTRO COLOR
Maggi
Magic Glue
MaitreTruffout
MAKO
MAKO BLUE
Malatec
Malimas
MAMUKO
Maped
MAR-POL
MARIE'S
MARIES
Marioinex
Marka niezdefiniowana
Markizeta
Markus
Marolex
Mars
Marshmallowfluff
Marvel
Marvo
Maserati
MASTER DARTS
Matex
Matheo
Mattel
Maul
Max Rever
Maxbrands Marketing
Maxell
Maxim
Maxter
MAXXPRO
Mayeri
MCR
MediaRange
Medivet
Mega Blocks
Meike
Meister Moulin
Meli
Melitta
MemoBe
Memoboards
MEOWBABY
MERCATOR
MERCEDES
Mercury
MERIDA
Merz Consumer Care Austria GmbH
Mesko
Method
Mga
Michalczyk i Prokop
MICHELIN
Mickey Mouse
Migos
MIKASA
Milka
Mill Clean
MIMIJUMI
MINIKOIOI
Minions
Minnie Mouse
Miraculum
MissSpace
Miśki
MJX
Mobilo
MobyFox
Mocolo
MODEL MASTER
Modep
Modern
Mokate S.A.
Mokopico
Mola
Molang
Moleskine
Molpharma
Molyka
Momax
Mondelez
Mondi
Mondo
MORAJ
Moreno
Moritz
Morphun
Moser Roth
Moses
Moshi
Moxom
MP-JET
MPC
Mr. Tom
MSP
Muduko
Muhlhauser
Mulieres
MULTIGRA
Multilaser
Multy
Mutti-Parma
My baby & me
My Bag's
MYOFFICE
N/N
Naif
Nałęczowianka
Nasze
Natra Onati,S.A.
Natursutten
NAVIGATOR
Naxos
NC
NC Koperty
NCTE
Nefere
Nefretete
Neneko
NEO
Nerchau Niemcy
Nerchau PALETA ART Lechicka 15/3U, 02-156 Warszawa
Nescafe
Nestea
Nestle
NETEX
New Classic Toys
Newmero
Nexgen Skins
NEXXT
Nieznany
Nillkin
NISSEI
NIVEA
No Fear
Nobo
Nordic Elements
Noris
Novus
NQD
NST
Nugape
Oatly
Obliq
Obludarium
Odcisk Bobasa
Office Products
OGRIFOX
Old Spice
Ombia
Omega Pharma Deutschland
Only
Opti
Optihome
Orange Toys
Orbico Sp. z o. o.
ORPLAST
Oscar Weil GmbH
Others
Out of the blue
Oval
Oxford
PACIFIC
PACTRA
Paglieri SPA - S.S.
PAKADO
PAKO
Palmolive
Pampers
Pan Ogrodnik
Panasonic
Panta Plast
Papagena
Paper Mate
Papi
PAPSTAR
Parker
Patisse
Pattex
Paul Lorens
Paw Patrol
PB
PEDIGREE
PEDROS
Pelikan
Pellini
Penac
PENN
Pentel
Peppa Pig
PERFECT
Perfetti Van Melle
Perrigo Omega Pharma Int.
PETITE&MARS
PETS COLLECTION
PEZ
PHC
Philips
Piacelli
Piasten
Pilot
Piórex
Pix-it
PIXEL
PIXIE
PK-MOT
Plafor
PLAST TEAM
Playme
PLAYMOBIL
PlayToyz
PlusPlus
POL
POL-HUN
Polar Lights
Pollena
Polski
Polski producent
POLSPEED
Popular Playthings
Posca
Post-it
PRESTO
PRIMA
Prince Polo
Princess
Pringles
Pritt
PRO SERIES
PROBEACH
Procter & Gamble
PRODUCENT
Producent niezdefiniowany
Producent2
Proedge USA
PROFICE
PROGARDEN
Pronto
PROSPERPLAST
Protect Garden
PROTECTO
Prototype
Prouna
PROWORLD
Przyjazne Zabawki
Przykładowy
Przystań
PULP BAMABOO
PULP BAMBOO
PUMA
Pupus
PUR
Pure 2 Improve
PURE 4 FUN
PureGear
Purity
Purlov
Puro
Pusheen
Q-CONNECT
Q-Model
Quartz
QUEDI
Quirky
Quokka
R COPY
R-SPORT
Radexim
Radziemska
Rafi
RAPEKS
Rapid
RAVANSON
Re-Cycle-Me
REAL CHIMICA SRL
REAL MADRYT
Reckitt Benckiser
REDCLIFFS
ReDo
Redox
Reese
Regupol
Reiner
REIS
Repest
Revell
REX
Rexel
Ricola
Riess
Rifle Paper
RINGSTAR
Ritter Sport
Roesle
Rokus
ROMET
Romy
ROTRING
Royal
RoyalBaby
ROYOKAMP
RUBBER LOOPS
RUBICON
Ruf
Rufia
Ruhhy
Russel
Rystor
S.C. Johnson
SABA
Sachets
Saga
Samsung
SAN
SanDisk
Santoro London
Sanwa
Sapro
Sara
Sara.net.pl
Sarantis
Sarantis Polska S.A.
SASKA CHRISTMAS
SASKA EASTER
SASKA GARDEN
SASKA GIFT AND DECOR
SAVO
Sax
SC Johnson Ltd
SCATCH
Schleich
Schluckwerder GmbH
Schneider
Scholetta
Schulte-Ufer
Schwarzkopf & Henkel
Science4You
Scotch
SCOTCH BRITE
Scotch-Brite
SEAFLO
Securitex
Segafredo
SELECT
Sellmar
Selman
Sence
Senti Oils
SERVICE PACK
Setino
SEZONA
Sharpe
SHARPIE
Shmidt Group LTD
SIATEX
SIDOLUX
Sigikid
Signal
Siku
Silit
SILOO.PL
Silver
Simba
Simplet
Simplicol
SirCharles
SKAWA
Skippi
Skmei
Skydog
SkyFlyer
SLAZENGER
Słonik Jumbo
Smart
Smart Eco Wash
Snackline
Snappi
Snoopy
SNOWMAN
Sodasan
SodaStream
Soldan
SOLIDLY
Somat
Soulima
Spacerail
SPALDING
Speck
SpeedexX
Spiderman
Spigen
Splash
Spod Igły i Nitki
SPONETA
SPORTOP
Springer Pinsel
SPRITE
SPUNI
Stabilo
Stacja Partnerska Shell
Staedtler
Stamp
STANLEY
Star Wars
Stardrops
Statestrong
Stefanplast
Stella
STICK'N
Stilo
Stiratini
STM
Storck
STR8
STRIGO
SULIMA
Sun BABY
Suncity
Sunkid
Super Mario
Super Zings
Superman
Swetry
Syma
SZOMIK.PL
TAGO
TARIFOLD
Tasty Peach
Tchibo
TCW USA
Teekanne
TEGU
TEKSON
TEN!
TENZI
TERG S.A.
Terry's
TESA
TESLA
Tesoro
Testarossa
Tetis
TETLEY
THAI GLICO CO.,LTD
The Pink Stuff
Thermoplast
Thetford
Think `n Pack
Thomy
Thumbs UP!
Tigres
Tiny Bike
Tiom
Tipp-Ex
Today
Toma
Tommy Hilfiger
TOOR
Top 2000
Top Bright
TOP TOOLS
TOP-CHEM
TopCar
TOPEX
TopHeli
TopStoc
Topwrite
Tork
Torseed
Tower Pro
Toyota
Trader Joe's
Transcend
Trawnik Polski
Trefl
TRIGONA
Trixie
Trizand
Trodat
Trolli
TROPHEE
Trust
TRYUMF
TUBAN
Tucano
Tuf Tuf
Tullo
Turku
Tymbark
Typhoo Tea Ltd.
TYPOGRAF
TZMO S.A.
UHU
Umbro
UmiPled
UNDER ARMOUR
Undercover
Uni
Unia
Unia - Cotton Cloud
Unilever
Unilight
UNILUX
UNIONL
Uniszki
US Polo Assn
UVEX
VADOBAG
Valenta
VALPE
Van Houten
VANISH
VAUPE
VDO
VECTOR
VELTORI
Velvet
VELVET CARE
VENUS
Verbatim
Vergnano
Vesper
VGATE
VI.6+
Vibac
VICTORINOX
VIKI
VILDEVIK
VILDEVIK Glamour
Vileda
VILEDA PROFESSIONAL
Vipera
Viscoplast
Vitax
VIVAB2B
Vivil
VIZARI
VIZIR
VTech
W. Kinkartz GmbH
WADER
WAFI
WallMarket
WAMAZ
WAMOD
Warmtec
WäscheMeister
WaschPulver
Waterman
Waterzone
Wedel
Wekome
Wendre
Wenger
WEPA
Werner & Mertz Delta
Wesco
Westminster
WHISKAS
Wiha gmbh
Wiko
Wilhelm Reuss GmbH
Wilkinson Sword
WILSON
Winter Traum
Wisdom
WL Toys
WMF
Wonder
Wooden City
Woodyland
Woogie
Woolite
Wrapsol
Wrigleys
X-Bida
X-Doria
Xanto
Xiong
Xpel
Xpel Marketing Ltd
XQMAX
XTERRA
XTracGear
Xtrobb
XVIDA
Yankee Candle
Yellow One
York
YORK PL Sp. z o.o. sp.k.
YumYum
Zakład Produkcyjno-Handlowy SIATEX
ZAP
Zaratex
Zeiss
Zentis
ZhenGrun
ZIAJA
Zipato
Zizo
Zoflora
ZOLUX
Zoom
Zwoltex
Żywiec Zdrój
  • Produkty podobne
  • Ostatnio oglądane produkty
  • Inni Klienci kupili również
Akumulator Energizer Power Plus E HR22 175mAh
Akumulator Energizer Power Plus E HR22 175mAh
60.00
Akumulatorki Energizer Extreme AA HR6 2300mAh (2)
Akumulatorki Energizer Extreme AA HR6 2300mAh (2)
40.00
Akumulatorki Energizer Power Plus C HR14 2500mAh (2)
Akumulatorki Energizer Power Plus C HR14 2500mAh (2)
60.00
Akumulatorki Energizer Power Plus D HR20 2500mAh (2)
Akumulatorki Energizer Power Plus D HR20 2500mAh (2)
60.00
Akumulatorki Energizer Universal AA HR6 1300mAh (4)
Akumulatorki Energizer Universal AA HR6 1300mAh (4)
38.00
Arkusze olejowe do niszczarek Fellowes PowerShred (10)
Arkusze olejowe do niszczarek Fellowes PowerShred (10)
53.00
Baterie Energizer Alkaline Power AA LR6 1.5V (24)
Baterie Energizer Alkaline Power AA LR6 1.5V (24)
48.00
Baterie Energizer Alkaline Power AAA LR3 1.5V (24)
Baterie Energizer Alkaline Power AAA LR3 1.5V (24)
48.00
Baterie Energizer Ultimate Lithium AA LR6 1.5V (4)
Baterie Energizer Ultimate Lithium AA LR6 1.5V (4)
44.00
Sklep internetowy na oprogramowaniu Sky-Shop.pl sky-shop.pl
  • Sklep zamknięty