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US Patent: 1,228,210
Screw-jack
Patentee: Isaiah E. Hindman (exact or similar names) - Bellevue, PA USPTO Classifications: 254/103, 74/665Q, 74/89.29, 74/89.38 Tool Categories: material handling : jacks : screw jacks Assignees: Duff Mfg. Co. - Pittsburgh, PA Manufacturer: Duff Mfg. Co. - Pittsburgh, PA Witnesses: George A. Young	Patent Dates: Applied: Feb. 26, 1916 Granted: May 29, 1917 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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