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US Patent: 2,240,440
Apparatus for Honing Internal Screw Threads
Patentee:
Joseph H. Hoern - Birmingham, Oakland County, MI

USPTO Classifications:
451/470

Tool Categories:
metalworking machines : honing machines

Assignees:
Eaton Mfg. Co. - Cleveland, Cuyahoga County, OH

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Dec. 05, 1940
Granted: Apr. 29, 1941

Patent Pictures:
USPTO pdf tiff
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