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4 Matching Results
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Ladder.
Patent for a ladder that will allow its prop legs to be slided longitudinally of the main ladder legs to form an extension ladder.
Date:
May 23, 1912
Creator:
Vierheller, Paul E.
System:
The Portal to Texas History
Improvement in Gang-Plows.
Patent for a new, improved gang-plow for preparing and cultivating land for planting. Illustrations included.
Date:
March 23, 1875
Creator:
Scheumack, Stephen S.
System:
The Portal to Texas History
Improvement in Cultivators.
Patent for improvement in horse-drawn cultivators.
Date:
April 23, 1872
Creator:
Jordan, Hugh Paxton
System:
The Portal to Texas History
Improvement in Cultivators.
Patent for changes in the construction of a cultivator.
Date:
May 23, 1871
Creator:
Walker, Leander
System:
The Portal to Texas History