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3 Matching Results
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Oxygen-Generator
Patent for an oxygen generator that refills as it is emptied.
Date:
February 7, 1911
Creator:
Bradley, Richard Clinton
Object Type:
Patent
System:
The Portal to Texas History
Caddo Lake State Park
Map of the Caddo Lake State Park outlining hiking trails and highlighting activities, facilities, and other features such as bathrooms, lodgings, water/electric, etc. It also contains general information for the park and for the Texas Parks and Wildlife Department.
Date:
February 2012
Creator:
Texas. Parks and Wildlife Department.
Object Type:
Map
System:
The Portal to Texas History
Pipe-Wrench.
Patent for improvements to pipe wrenches to a more simple design.
Date:
February 16, 1915
Creator:
Lewis, Guy V.
Object Type:
Patent
System:
The Portal to Texas History