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US Patent: 51,517
Improvement in Calipers Combination Calipers and Level
Patentee: Benjamin Green Martin (exact or similar names) - Philadelphia, PA USPTO Classifications: 33/801 Tool Categories: layout tools : calipers layout tools : levels : pendulum levels Assignees: Watson Sanford - Philadelphia, PA LLoyd H. Walton - Philadelphia, PA Thos. M. Davis - Philadelphia, PA Benjn. G. Martin - Philadelphia, PA Manufacturer: Unknown Witnesses: Benjn. Morrison B. F. Shattuck	Patent Dates: Granted: Dec. 12, 1865 Patent Pictures: [ 1 | 2 ] USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a set of machinist calipers which features a swinging indicator to allow it to act as a simple pendulum level.

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