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US Patent: 407,617
Centering Device
Patentee:
Frederic A. Seaver (exact or similar names) - Hartford, CT

USPTO Classifications:
33/632

Tool Categories:
layout tools : marking gauges : center marking gauges

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
A. B. Jenkins
C. L. Burdett
Patent Dates:
Applied: Apr. 09, 1889
Granted: Jul. 23, 1889

Patent Pictures:
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