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US Patent: 417,659
Means for Operating the Die Heads of Bolt Threading Machines
Patentee:
John Sellers Bancroft - Philadelphia, PA

USPTO Classifications:
279/71, 408/176, 470/75

Tool Categories:
metalworking machines : metal threading machines

Assignees:
William Sellers & Co. - Philadelphia, PA

Manufacturer:
Not known to have been produced

Witnesses:
Unknown

Patent Dates:
Applied: Oct. 18, 1889
Granted: Dec. 17, 1889

Patent Pictures:
USPTO pdf tiff
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"Vintage Machinery" entry for William Sellers & Co.

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