Image: Slavoljub Eduard Penkala
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Description: Photo of Slavoljub Penkala, inventor of the mechanical pencil and the fountain pen; photo taken in 1920.
Title: Slavoljub Eduard Penkala
Credit: http://www.rinatravel.com/uploads/about_croatia/suveniri/Slavoljub_Penkala.jpg
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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