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US Patent: 455,994
Lifting-jack
Patentee: Josiah Barrett (exact or similar names) - Allegheny, PA USPTO Classifications: 254/111 Tool Categories: metalworking tools : lifting jacks Assignees: Duff Mfg. Co., Ltd. - Allegheny, PA Manufacturer: Duff Mfg. Co., Ltd. - Allegheny, PA Witnesses: James I. Kay Robert D. Totten	Patent Dates: Applied: Feb. 13, 1891 Granted: Jul. 14, 1891 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Jeff Joslin Vintage Machinery entry for Duff Mfg. Co.
Description: This patent provides a simplified mechanism for the jack of patent 399,470.

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