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US Patent: 933,912
Protractor Level
Patentee:
Albert J. Matter (exact or similar names) - Portland, Multnomah County, OR

USPTO Classifications:
33/351, 33/391

Tool Categories:
layout tools : levels : clinometers
layout tools : protractors

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Unknown
Patent Dates:
Applied: Jun. 10, 1908
Granted: Sep. 14, 1909

Patent Pictures:
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