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Testing And Grading Watch-Balances And Hair-Springs Patent Print - Chalkboard Patent Title: Testing And Grading Watch-balances And...read more
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Testing And Grading Watch-Balances And Hair-Springs Patent Print - Chalkboard Patent Title: Testing And Grading Watch-balances And Hair-springs Inventor Name: Edward Marsh John Logan And Duane Church Year Issued: March 29 1887 Item Number: ...