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US Patent: 380,836
Combined Outside & Inside Calipers
Patentee:
Oliver D. Warfield (exact or similar names) - Chicopee Falls, MA

USPTO Classifications:
33/558.05

Tool Categories:
layout tools : calipers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Howard Bigelow
Charles Cushman
Patent Dates:
Applied: Nov. 03, 1887
Granted: Apr. 10, 1888

Patent Pictures:
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