4 Matching Results
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Tunnel-Driving Machine.
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.
System:
The Portal to Texas History
Valve for Explosive-Engines.
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.
System:
The Portal to Texas History
Packing-Ring for Piston-Rods.
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
System:
The Portal to Texas History
Matrix-Molding Device
Patent for improvements to matrix-molding devices, "and the object is to provide simple devices which are carried by the matrices or molding devices for forming rule retaining members which have angular grooves" (lines 14-17).
Date:
September 12, 1913
Creator:
Markwell, Andrew E.
System:
The Portal to Texas History