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US Patent: 1,228,210
Screw-jack
Patentee:
Isaiah E. Hindman - Bellevue, PA

USPTO Classifications:
254/103, 74/665Q, 74/89.29, 74/89.38

Tool Categories:
trade specific : automobile mechanic

Assignees:
Duff Manufacturing Co. - Pittsburgh, PA

Manufacturer:
Duff Manufacturing Co. - Pittsburgh, PA

Witnesses:
George A. Young

Patent Dates:
Applied: Feb. 26, 1916
Granted: May 29, 1917

Patent Pictures:
USPTO pdf tiff
Google Patents
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"Vintage Machinery" entry for Duff Manufacturing Co.

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