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Combined Disk Harrow and Land-Roller
Patent for a vehicle that may be used as either a harrow or a roller. Illustrations included.
Date:
May 19, 1908
Creator:
Jackson, Lewis Livingston
System:
The Portal to Texas History
Improvement in Construction of Jails.
Patent for improvement in construction of jails; in which a system of flues in between layers of a double floor provide ventilation through grates in the walls and upper layer of the floor, without compromising security.
Date:
October 19, 1875
Creator:
Seeber, John A. & Croxton, James C.
System:
The Portal to Texas History