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US Patent: 61,799
Improvement in Calipers
Patentee: H. A. Boardman (exact or similar names) - New Haven, CT USPTO Classifications: 33/558.1 Tool Categories: layout tools : calipers Assignees: None Manufacturer: Not known to have been produced Witnesses: Theo. Tusch J. A. Service Charles C. Blatchley Philip Pond	Patent Dates: Granted: Feb. 05, 1867 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This design covers a fairly typical caliper with a screw adjust for the arms and a spring to keep the arms in tension.

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