File.
Description:
Patent for a new and improved file. This design consists in "[a] file provided with longitudinal teeth upon one or both of its edges . . . [and] upon its sides so cut that they extend only half-way across the width of the file, the inner ends of the said teeth meeting at an angle at the center of the width of the blade" (lines 50-56).
Date:
March 18, 1884
Creator:
Custer, George.
Item Type:
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Patent