Patents for John J. O'Brien


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