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US Patent: 1,147,476
Lifting-jack
Patentees: Isaiah E. Hindman (exact or similar names) - Oakmont, PA Walter McH. Alston (exact or similar names) - Ben Avon, PA USPTO Classifications: 254/110, 254/111, 74/157, 81/63 Tool Categories: Assignees: Duff Mfg. Co. - Pittsburgh, PA Manufacturer: Duff Mfg. Co. - Pittsburgh, PA Witnesses: Jacob Wittmer George A. Young	Patent Dates: Applied: Jan. 26, 1915 Granted: Jul. 20, 1915 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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