Image: Analog clock with digital display
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Description: Inner workings of a "flip clock" where a digital display is driven by a system of gears and motors.
Title: Analog clock with digital display
Credit: http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=3220174
Author: E. Cappellari
Permission: United States Patent illustration
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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