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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:
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Vintage Machinery entry for Duff Mfg. Co.

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