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Verification of the ISSN
Calculator allows you to verify the number entered ISSN (International Standard Serial Number serial publication). FAQ: How ISSN number?
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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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Calculator allows you to verify the number entered EAN-13.
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The calculator calculates the amount of collected rainwater from the roof of the given dimensions.
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The frequency of the relaxation based on the Arrhenius equation
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