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US Patent: 388,669
Micrometer-Calipers
Patentee:
Edgar J. Hadley - 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 pdf tiff
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Description:
An exceedingly accurate machinist's tool-- a combination micro-adjustable calipers with a micro-adjustable scratch gage.

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