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Well-Casing Grapple
Patent for a well-casing grapple, allowing a positive grip when lowering casing or pipe within a well, or withdrawing it therefrom, without the danger of slipping or accident.
Date:
April 30, 1918
Creator:
Artzt, Erich C.
System:
The Portal to Texas History
Music-Leaf Turner
Patent for a music leaf turner to turn the pages of sheet music for pianists. Illustrations included.
Date:
April 2, 1912
Creator:
Meier, Ernst
System:
The Portal to Texas History