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US Patent: 1,007,400
Calipers
Patentee: William Speer (exact or similar names) - Baltimore, MD USPTO Classifications: 33/812 Tool Categories: metalworking tools : machinist tools : measuring tools : indicating calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: Unknown	Patent Dates: Applied: May 09, 1911 Granted: Oct. 31, 1911 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Joel Havens

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