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US Patent: 416,719
Combined Drawing and Measuring Instrument
Patentee: William G. Curtis (exact or similar names) - Philadelphia, PA USPTO Classifications: 33/27.032, 33/458 Tool Categories: rules : folding rules Assignees: None Manufacturer: Not known to have been produced Witnesses: Edward A. Oetzel William Harr	Patent Dates: Applied: Mar. 16, 1889 Granted: Dec. 10, 1889 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Russ Allen.

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