Combination Rule, Square, and Miter. (open access)

Combination Rule, Square, and Miter.

Patent for a combination of devices that contains "attachments for folding rules which will make said rules capable of use as a square, tri-square, and miter" (lines 15-17), including instructions and illustrations.
Date: August 4, 1914
Creator: McFarland, Charles M.
System: The Portal to Texas History