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Patents for Cogsdill Twist Drill Co.
Patents 1 - 3 of 3
First set of recordsLast set of records
NumberDatePatenteeTitleType
2,242,510May 20, 1941S.A. CogsdillAdjustable countersink structuremetalworking countersinks
2,308,055Jan. 12, 1943S.A. CogsdillAdjustable countersink structuremetalworking countersinks
2,811,875Nov. 05, 1957S.A. CogsdillTwist Drill Having Oil Passages Therein and Method of Construction metalworking twist drills
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