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US Patent: 148,065
Improvement in Calipers
Patentee: Eli Horton (exact or similar names) - Windsor Locks, CT USPTO Classifications: 33/558.2 Tool Categories: layout tools : calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: Wm. E. Simonds John Pollitt Timothy E. Steele	Patent Dates: Applied: Dec. 11, 1872 Granted: Mar. 03, 1874 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This design is for a "3-point" caliper, used for accurately taking the diameter of a screw inside the thread.

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