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Tunnel-Driving Machine.

Description: Patent for "new and useful Improvements in Tunnel- Driving Machines" (lines 5-6), including instructions and illustrations.
Date: September 2, 1913
Creator: Speer, George F.
Partner: UNT Libraries Government Documents Department

Valve for Explosive-Engines.

Description: Patent for engine valves (rotary type) that are noiseless, connected to the the engine cylinders so that they are self grinding and self adjusting, and that cover and uncover the spark plug in a way that prevents fouling it.
Date: September 2, 1913
Creator: Ray, Albert J.
Partner: UNT Libraries Government Documents Department

Packing-Ring for Piston-Rods.

Description: Patent for a packing ring that will go on conveniently and will create an effective packing without putting wear on the piston.
Date: September 2, 1913
Creator: Bryant, Clarence Ross
Partner: UNT Libraries Government Documents Department
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