File:Harrison H4 clock in The principles of Mr Harrison's time-keeper 1767.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 14:05, 20 December 2009 | 595 × 881 (84 KB) | commons>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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