US Patent: 1,989,652 - Method for finishing internal gears


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US Patent: 1,989,652

Method for finishing internal gears

Patentee:

Robert S. Drummond (exact or similar names) - Detroit, MI

USPTO Classifications:

29/90.01, 29/90.6, 76/115

Tool Categories:

metalworking machines : gear making machines

metalworking machines : grinders : lapping machines

Assignees:

National Broach & Machine Co. - Detroit, MI

Manufacturer:

National Broach & Machine Co., Inc. - Detroit, MI

Witnesses:

Unknown

Patent Dates:
Applied:	Jul. 30, 1932
Granted:	Jan. 29, 1935

Patent Pictures:

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Vintage Machinery entry for National Broach & Machine Co.

Description:

This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit, and the patent is a companion to patent 1,989,651. See that patent for more information.