The balance-wheel o* an average watch makes 300 vibrations per minute.
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https://paperspast.natlib.govt.nz/newspapers/OW19200302.2.214.1
Bibliographic details
Otago Witness, Issue 3442, 2 March 1920, Page 53
Word Count
11Page 53 Advertisements Column 1 Otago Witness, Issue 3442, 2 March 1920, Page 53
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