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Dental Handpiece.
Patent for an improvement on a dental handpiece that is made of fewer parts and is cheaper to make. It makes insertion and removal of the drill easier, and keeps the drill in place more securely.
Date:
August 17, 1920
Creator:
Graves, Robert E.
System:
The Portal to Texas History
Compound Air-Compressor.
Patent for an improved Compound Air-Compressor by having four cylinders, in pairings of a high pressure and a low pressure cylinders. The air from the low pressure cylinder will be fed to the high pressure cylinder. The pistons will work in succession rather than simultaneously.
Date:
February 17, 1920
Creator:
Jones, Oceola
System:
The Portal to Texas History