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Patents for Cogsdill Twist Drill Co.
Patents 1 - 3 of 3
Picture	Number	Date	Patentee	Title
	2,242,510	May 20, 1941	S.A. Cogsdill	Adjustable countersink structure
	2,308,055	Jan. 12, 1943	S.A. Cogsdill	Adjustable countersink structure
	2,811,875	Nov. 05, 1957	S.A. Cogsdill	Twist Drill Having Oil Passages Therein and Method of Construction

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