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File:Harrison H4 clock in The principles of Mr Harrison's time-keeper 1767.jpg

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English: Harrison_H4 clock_in The principles of Mr Harrison's time-keeper 1767
Date
Source [1]
Author Ferdinand Berthoud

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Date/TimeThumbnailDimensionsUserComment
current14:05, 20 December 2009Thumbnail for version as of 14:05, 20 December 2009595 × 881 (84 KB)World Imaging{{Information |Description={{en|1=Harrison_H4 clock_in The principles of Mr Harrison's time-keeper 1767}} |Source=[http://books.google.com/books?id=ch4JAAAAIAAJ&pg=PA1] |Author=Ferdinand Berthoud |Date=1802 |Permission= |other_versions= }} [[Category:Chr

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