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Counties
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Well Drilling Machine.
Patent for an improvement in well drilling.
Date:
April 10, 1900
Creator:
Wiedner, Friedrich R.
System:
The Portal to Texas History
Pyrometer.
Patent for improvement in pyrometers for more accurate and reliable use in cooking stoves.
Date:
December 25, 1900
Creator:
Von Koehring, Henry
System:
The Portal to Texas History