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Device for Removing Broken Screws, &c.
Patent for a new and improved device for removing broken screws. This design "is to provide a . . . bit specially designed for extracting screws, taps, screw-bolts, &c., from iron, marble, or other hard substances in case one of the said articles is broken off in the material into which it is screwed. The invention consists of a bit provided with an internal spiral cutting-thread and external cutters" (lines 7-15).
Date:
September 10, 1889
Creator:
Cahn, Maurice
System:
The Portal to Texas History