Dating parker duofold

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First patent Progress in developing a reliable pen was slow until the mid-19th century because of an imperfect understanding of the role that air pressure plays in the operation of pens. Barrel chasing is weak.

This pen has been tested for ink intake and has demonstrated that it takes in. Retrieved 26 July 2016. This eliminated the need to dunk the point in ink, and the subsequent need to wipe it.

Parker’s Date Coding Systems - In this code, the second digit represents the last digit of the year of manufacture.