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Expired
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Silas Wheelock Northup
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Individual
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Individual
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Publication of GB190508639ApublicationCriticalpatent/GB190508639A/en
8639. Northup, S. W. Apri 22. Cutters.-A tool 7 for milling the prongs of the settings of fingerrings has an interchangeable guiding- point 12 to take into the central holes of the settings. The point has a conical end 10, a threaded shank 11, and a shoulder to abut against the end of the tool 7.
GB190508639D1905-04-221905-04-22Improvements in Milling Tools
ExpiredGB190508639A
(en)