Trigonometer serving as protractor and parallel ru

Made:
1902-1920 in Ellsworth

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Trigonometer serving as protractor and parallel rule, steel, patented 8 April 1902 by the Hagan Company, Ellsworth, Maine

Details

Category:
Mathematics
Object Number:
1988-127
type:
parallel rules
credit:
Tesseract
status:
Permanent collection

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