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GB Patent: GB-517,106
Improvements relating to screw-thread milling machines
Patentee: Fred Archdale (exact or similar names) - Birmingham, England USPTO Classifications: Tool Categories: metalworking machines : metal threading machines : thread hobbing and thread milling machines Assignees: James Archdale & Co. Ltd. - Birmingham, England Manufacturer: James Archdale & Co. Ltd. - Birmingham, England Witnesses: Unknown	Patent Dates: Applied: Sep. 02, 1938 Granted: Jan. 19, 1940 Patent Pictures: Espacenet patent Report data errors or omissions to steward Jeff Joslin "Vintage Machinery" entry for James Archdale & Co.

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