Hydraulic Swivel (open access)

Hydraulic Swivel

Patent for a hydraulic swivel. Illustrations included.
Date: September 26, 1905
Creator: Thomson, Alexander & McLaughlin, Malacha Joseph
System: The Portal to Texas History
Patent for Plow (open access)

Patent for Plow

Patent for a wing plow.
Date: December 26, 1916
Creator: Moore, William F.
System: The Portal to Texas History