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US Patent: 388,669
Micrometer-Calipers
Patentee: Edgar J. Hadley (exact or similar names) - Baltimore, MD USPTO Classifications: 33/42, 33/806 Tool Categories: layout tools : compasses : trammels layout tools : marking gauges Assignees: None Manufacturer: Not known to have been produced Witnesses: John T. Maddon John E. Morris R. L. Clemmitt	Patent Dates: Applied: Feb. 08, 1888 Granted: Aug. 28, 1888 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: An exceedingly accurate machinist's tool-- a combination micro-adjustable calipers with a micro-adjustable scratch gage.

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