UNT Libraries Government Documents Department - 2 Matching Results
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- Automatic Regulator for Pneumatic Flues
- Patent for a regulated valve to automatically maintain air pressure in a pneumatic conveyor flue. Excessive air pressure causes a secondary valve to open and vent the pressure while at the same time impeding air flow downstream.
- Boat-Propeller.
- Patent for a boat propeller, which is inexpensive and adaptable to small boats. The propeller can go forwards or backwards and use multiple oars.