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Hydraulic Swivel.
Patent for a hydraulic swivel used with wells including instructions and illustrations.
Date:
May 16, 1911
Creator:
Layne, Mahlon E.; Hall, Samuel N. & Layne, Charles F.
System:
The Portal to Texas History
Valve-Grinder.
Patent for a valve grinder that fit together perfectly to prevent leakage and a consequent loss of power.
Date:
May 16, 1916
Creator:
Atkin, Frank R.
System:
The Portal to Texas History
Oil and Gas Burner
Patent for a burner that can use both oil and gas as fuel.
Date:
May 16, 1922
Creator:
Oney, William M.
System:
The Portal to Texas History