Combination Countersink and Bit-Gage.
Description:
Patent for a tool to be used with a drill or bit that allows the user to simultaneously drill and form a countersink. It also has a bit gauge that allows it to be used for drills of varying sizes.
Date:
March 23, 1920
Creator:
Storey, Henry L.
Item Type:
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Partner:
UNT Libraries Government Documents Department