3 Matching Results
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Elevator Controlling Device
Patent for improvements to the elevator controlling device. These improvements have to do with the main circuit being broken while the elevator doors are open, thus stopping the elevator from moving before the doors are fully closed.
Date:
September 13, 1921
Creator:
Quick, Charles F.
System:
The Portal to Texas History
Shoe-Heel Holder.
Patent for "the provision of means for removably holding a heel in position for attachment to a shoe...as to hold it against accidental displacement during the operation of securing it to the shoe..." (lines 10-12, 22-24). It also includes an illustration.
Date:
September 13, 1921
Creator:
Creed, William Thomas
System:
The Portal to Texas History
Motor-Driven Surface-Treating Machine.
Patent for a surface-treating machine propelled by a motor. The design is compact, economic, and more efficient than previous machines.
Date:
September 13, 1921
Creator:
Clarke, Alex A.
System:
The Portal to Texas History