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Primary view of Landing Device for Aeroplanes.
Martin, Ernest L.
September 7, 1920
Primary view of Water-Heating Attachment for Internal-Combustion Motors.
Clayton, Oscar B. & Oberwetter, George T.
December 7, 1920
Primary view of Well-Screen Cleaner.
Bashara, Samuel F.
June 7, 1921
Primary view of Treatment of Crude Petroleum for Purification.
Bostick, Joseph Wallace & Homer, Charles H.
June 7, 1921
Primary view of Pump.
Humason, Granville A.
June 7, 1921
Primary view of Casing-Head
McGarry, Henry S. & Carr, John D.
September 7, 1920
Primary view of Valve for Pumps.
Shevlin, Miles
June 7, 1921
Primary view of Pipe-Engaging Slip for Rotaries
Livergood, Gerald R.
June 7, 1921
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