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Primary view of Charge Firing Pin
Swanson, John N.
January 14, 1918
Primary view of Time-Switch.
Scholl, Max
January 15, 1918
Primary view of Locomotive Drifting-Valve.
Meister, Alfred A.; Surles, John W. & Boyle, Edmund F.
January 8, 1918
Primary view of Device For Extracting Cores From Wells.
Dodds, Redus D.
January 8, 1918
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