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US Patent: 1,389,028
Direct Reading Micrometer Caliper
Patentee:
Albert L. Colburn (exact or similar names) - New Haven, CT

USPTO Classifications:
33/819

Tool Categories:
metalworking tools : machinist tools : measuring tools : micrometers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
George D. Seymour
J. Harold Flynn
Patent Dates:
Applied: Mar. 04, 1920
Granted: Aug. 30, 1921

Patent Pictures:
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Description:
Seymour & Earle - patent attorneys

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