Patents for John J. O'Brien


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Patents for John J. O'Brien
Patents 1 - 4 of 4
Picture	Number	Date	Patentee	Title
	2,024,302	Dec. 17, 1935	J.J. O'Brien	Motor Mounting
	2,028,293	Jan. 21, 1936	J.J. O'Brien, M.W. O'Brien	Undercutting Attachment for Lathes
	2,075,297	Mar. 30, 1937	J.J. O'Brien	Belt Drive
	2,138,117	Nov. 29, 1938	M.W. O'Brien, estate of (deceased), J.J. O'Brien	Belt Tighener