Patent 1,075,710 - October 1913 - Dwight S. Goodwin, inventor
Introduced as the GOODWIN HOLLOW SETSCREW; produced as the BRISTO screw and
matching wrenches.
Contemporary ads note the screws could also be turned by a screwdriver with
appropriate blade width.
from January 1913 Hardware Dealers' Magazine
Later manufactured by the Bristol Company of Waterbury CT
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