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US Patent: 1,290,921
Micrometer Caliper
Patentee:
Joseph Allan Davidson (exact or similar names) - Indianapolis, IN

USPTO Classifications:
33/815, 33/821

Tool Categories:
layout tools : special purpose gauges
metalworking tools : machinist tools : measuring tools : micrometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
H. Woodard
Myron G. Clear

Patent Dates:
Applied: Apr. 30, 1918
Granted: Jan. 14, 1919

Patent Pictures:
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Description:
Munn & Co.- patent attorneys

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