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Combustion Apparatus
Patent for a combustion apparatus that will maximize the heat produced with any given amount of fuel.
Date:
December 14, 1920
Creator:
Anderson, Robert James
System:
The Portal to Texas History
Drill-Bit-Retaining Device
Patent for a new and improved “drill bit retaining devices for drills of the hammer type”(lines 12-13), including an illustration.
Date:
December 14, 1915
Creator:
Weiner, Rudolph S.
System:
The Portal to Texas History