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Improvement in Ground-Squirrel Exterminators.
Patent for an "improved apparatus by means of which ground-squirrels and gophers can be destroyed in their holes, conveniently and effectively, and at small expense" (para. 4). The mechanism works by gassing underground vermin with sulphuric fumes.
Date:
July 10, 1877
Creator:
Dreyer, Henry
System:
The Portal to Texas History