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Chronometer escapement model, by Parkinson and Frodsham, London, c. 1820 - Putnam Gallery - Harvard University - DSC07925
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Published by:
Creazilla
Author:
Daderot
Source:
commons.wikimedia.org
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self-published work
cc-pd-mark
author died more than 100 years ago public domain images
cc-zero
escapement models
scientific instruments in the harvard university science center
parkinson & frodsham
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