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NIP correctness in Poland

Jak sprawdzić poprawność numeru NIP?
Verifier allows you to validate the tax identification number entered

Tax identification number is a code used to identify taxpayers in Poland, which consists of 10 digits.



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Verification ISBN preview

Jak sprawdzić numer ISBN?
Jak zweryfikować numer ISBN?
Calculator allows you to verify the ISBN number entered.
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Verification of the social security number in Poland

It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.
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Verifier numbers EAN-13 preview

 Verifier numbers EAN-13 Calculator allows you to verify the number entered EAN-13.          
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The distance calculator between cities Polish

Calculator helps you calculate the distance in a straight line between two selected major Polish cities.      
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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Resistivity and conductivity

The calculator calculates the resistivity and conductivity of the material from the resistance, cross-sectional area and the length of the element at 20 ° C.            
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Calculator VAT refund for building materials

The calculator calculates the amount of VAT that can be refunded in respect of incurred expenses associated with the purchase of construction materials.                    
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Weighted average ratings

The calculator calculates the weighted average of the ratings of the following items.