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US Patent: 415,944
Combined Rule and Protractor
Patentees:
Heinrich Horn (exact or similar names) - New York, NY
Charles Gerhardt (exact or similar names) - New York, NY

USPTO Classifications:
33/496

Tool Categories:
rules

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Carl Karp
John A. Straley
Patent Dates:
Applied: Nov. 03, 1888
Granted: Nov. 26, 1889

Patent Pictures:
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