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US Patent: 2,303,270
Spindle Speed Control Mechanism for Machine Tools
Patentee: Charles L. Grover (exact or similar names) - Philadelphia, PA USPTO Classifications: 29/26R, 29/64, 408/132, 74/333, 82/143 Tool Categories: metalworking machines : machine tool controls Assignees: William Sellers & Co., Inc. - Philadelphia, PA Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: Jan. 30, 1942 Granted: Nov. 24, 1942 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens "Vintage Machinery" entry for William Sellers & Co.

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