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US Patent: 1,089,703
Friction-clutch device Friction clutch for screw-jacks
Patentee: Isaiah E. Hindman (exact or similar names) - Crafton, PA USPTO Classifications: 188/82.3, 188/82.84, 192/47, 254/103 Tool Categories: material handling : jacks : screw jacks industrial machines : industrial machine mechanisms : industrial machine clutches Assignees: Duff Mfg. Co. - Pittsburgh, PA Manufacturer: Duff Mfg. Co. - Pittsburgh, PA Witnesses: C. P. Byrnes George B. Bleming	Patent Dates: Applied: May 07, 1912 Granted: Mar. 10, 1914 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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