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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
Process of Purifying Flour During The Manufacture Thereof
Patent for a mechanism related to the purifying of flour during manufacturing.
Date:
September 21, 1915
Creator:
Smith, George Thomas
System:
The Portal to Texas History