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US Patent: 146,974
Improvement in Ring Gages for Jewelers
Patentee: Francis E. Allen (exact or similar names) - Keene, NH USPTO Classifications: 33/494, 33/514.1, 33/555.2, D10/64 Tool Categories: rules gauges Assignees: None Manufacturer: Unknown Witnesses: R. H. Porter Henry Colony O. G. Nims	Patent Dates: Applied: Jul. 02, 1873 Granted: Feb. 03, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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