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GB Patent: GB-501,911
Improvements in variable speed drives in precision grinding machines
Patentee: Harry Hales Asbridge (exact or similar names) - Ashton-on-Mersey, England USPTO Classifications: Tool Categories: Assignees: Churchill Machine Tool Co., Ltd. - Altrincham, England Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Oct. 25, 1938 Granted: Mar. 07, 1939 Patent Pictures: Espacenet patent Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for Churchill Machine Tool Co., Ltd.

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