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US Patent: 511,923
Jack
Patentee:
Josiah Barrett (exact or similar names) - Allegheny, PA

USPTO Classifications:
254/110, 74/155, 74/159, 74/169

Tool Categories:
metalworking tools : lifting jacks

Assignees:
Duff Mfg. Co., Ltd. - Allegheny, PA

Manufacturer:
Duff Mfg. Co., Ltd. - Allegheny, PA

Witnesses:
J. N. Cooke
D. L. Dorsey

Patent Dates:
Applied: Mar. 03, 1893
Granted: Jan. 02, 1894

Patent Pictures:
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Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for Duff Mfg. Co.
Description:
Improvements to patents 312,316 and 455,993.

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