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Counties
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Speed-Changing Gear.
Patent for an automatic speed changing gear for trains.
Date:
October 27, 1908
Creator:
Mayo, William C. & Houlehan, John
System:
The Portal to Texas History
Governor for Explosive-Engines.
Patent for a governor for explosive engines for use in trains, which will increase the fuel efficiency of the engines.
Date:
April 27, 1909
Creator:
Mayo, William C. & Houlehan, John
System:
The Portal to Texas History