Resource Type
Counties
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Player Piano
Patent for a new form of valve for mechanical piano operated by pneumatic mechanisms in which the value is self-centering and does away with the guide pin usually employed, and an amplification of the wippen so that the striker rod is placed at the front of the pneumatic mechanism where it is accessible. The change in leverage permits the use of a smaller pneumatic.
Date:
January 31, 1922
Creator:
Pace, Vara L.
System:
The Portal to Texas History
Method of Purifying Oils
Patent for a new and useful improvement in the method of purifying oils, particularly applicable to cracked gasoline.
Date:
January 10, 1922
Creator:
Alexander, Clive M.
System:
The Portal to Texas History