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Primary view of Tunneling-Machine.
Dana, Frank L.
December 30, 1919
Primary view of Pump.
Graf, Sydney H.
September 30, 1919
Primary view of Pump
Humason, Granville A.
December 30, 1919
Primary view of Self-Cleaning Pump-Valve
Graf, Sydney H.
September 30, 1919
Primary view of Rotary Boring-Drill.
Humason, Granville A.
December 30, 1919
Primary view of Combination Drill Bit and Drill Shank
Humason, Granville A.
December 30, 1919
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