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US Patent: 292,630
Pipe-lifter for oil-wells
Patentees:
James B. Duff (exact or similar names) - Pittsburgh, PA
Samuel K. Duff (exact or similar names) - Allegheny, PA

USPTO Classifications:
254/30

Tool Categories:

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

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

Witnesses:
T. F. Lehmann
R. H. Herron

Patent Dates:
Applied: Oct. 15, 1883
Granted: Jan. 29, 1884

Patent Pictures:
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Vintage Machinery entry for Duff Mfg. Co.

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