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Verifier ISMN numbers

Calculator allows you to verify the number entered ISMN (International Standard Serial Number Printing music).      


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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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Kalkulator powierzchni dachu

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Kalkulator umożliwia obliczenie powierzchni dachowych w wariantach : jednospadowy, dwuspadowy, trzyspadowy, czterospadowy.
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Map Scale Converter

Calculator allows to determine the actual distance corresponding to the distance on the map with the specified scale. If the map at 1:500,000 scale the input field, enter the value 500000.  
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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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How do I calculate vacation? Calculator dimension leave in Poland

jak wyliczyć urlop wypoczynkowy? jak obliczyć urlop? jak się liczy urlop wypoczynkowy?
Calculator by entering the type of secondary education and the start and end dates of employment shall calculate the chargeable period of annual leave.                  
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Rainwater tank

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