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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: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Duff Mfg. Co.

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