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Coin-Controlled Vending-Machine
Patent for a pencil vending machine that is coin-operated, with illustrations.
Date:
September 5, 1911
Creator:
Mathes, John W.
System:
The Portal to Texas History
Oil-Converting Apparatus.
Patent for an apparatus that can be built at moderate cost, which will enable a high rate of commercially efficient work to reduce "the specific gravity of various grades of hyrdo-carbon oils, especially those of a semi-refined character" (lines 22 - 24).
Date:
October 28, 1919
Creator:
Adams, Joseph H.
System:
The Portal to Texas History