UNT Libraries Government Documents Department - 4 Matching Results
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- Breast Pump
- Patent for a maual breast pump. Illustration included.
- Engine Valve Mechanism
- Patent for an engine valve mechanism. This invention is a "class of steam engines wherein the cylinder-inlet and exhaust-ports are controlled by separate and distinct values." Illustration included.
- Plow Colter
- Patent for plow colter. Illustration included.
- Railway Crossing Gate
- Patent for an automatic railway crossing gate. Illustration included.