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Primary view of Valve Structure for Oil-Wells.
McEvoy, John Philip
September 19, 1919
Primary view of Mechanical Toy Hoop
Giesecke, Leo
September 5, 1916
Primary view of Stand-Value for Oil-Well Pumps.
Slaughter, George W., Jr.
September 24, 1918
Primary view of Nut-Lock
Lance, Andrew M.
September 6, 1910
Primary view of Spring-Wheel
Hudson, Alexander S.
September 24, 1912
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