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US Patent: 3,413X
Improvement in the sliding sector plane
Protractors
Patentee:
Gabriel H. Thompson (exact or similar names) - Boston, MA

USPTO Classifications:
33/424

Tool Categories:
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Granted: Dec. 04, 1821

Patent Pictures:
Patent Fig. 1
USPTO (New site tip)
Google Patents
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Description:
Patent is missing pages

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