UNT Libraries Government Documents Department - 2 Matching Results
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- Pumping Apparatus.
- Patent for a pumping apparatus that has "certain improvements in that class of pumps known as ejectors for raising liquids out of wells by means of compressed air or stream" (lines 9-12). The pump quickly and easily raises large amounts of water and is an improvement on a patent previously granted to the inventor (No. 474,819).
- Safety-Envelop
- Patent for an envelope that cannot be removed without obvious sign of tampering.