When did phillips screw come on the flea market?

or when where they first made. and/or available to the public


Answers:    The Phillips skipper screw was invented by a Mr. Henry F. Phillips of Portland, Oregon, within 1934. They became a public tool shortly thereafter.
The Phillips screw drive have slightly rounded corners in the tool bay, and was designed so the driver will slip out, or cam out, underneath high torque to prevent over-tightening. The Phillips Screw Company be founded in Oregon contained by 1933 by Henry F. Phillips, who bought the design from J. P. Thompson. Phillips was inept to manufacture the design, so he passed the rights to the American Screw Company, who was the first to make it.
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