Image: ATG - NPTM Photothon 53
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Description: Aclock-automat for calculation of the working hours, beginning of XX century. Exhibit of the National Polytechnic Museum in Sofia, Bulgaria.
Title: ATG - NPTM Photothon 53
Credit: Own work
Author: Antonio Georgiev
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: http://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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