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US Patent: 256,062
Calipers
Patentee: Edward C. Smith (exact or similar names) - Brooklyn, NY USPTO Classifications: 33/558.06 Tool Categories: layout tools : calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: C. L. Strong K. Newell F. B. Harris F. A. Somes	Patent Dates: Applied: May 19, 1881 Granted: Apr. 04, 1882 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: These calipers use an adjustable worm gear mounted on one arm that engages teeth cut into the end of the other.

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