UNT Libraries Government Documents Department - 2 Matching Results
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- Carbid-Feed Device for Acetylene-Gas Generators.
- Patent for a carbide-feed device for Acetylene gas generators, which prevents moisture from getting into the carbide and causing it to stick to the walls of the feed tube.
- Telephone Attachment.
- Patent for a telephone attachment for multi-party lines, which allows the user to hold the line against eavesdropping by other users on the line and let multiple people use the line at the same time.