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Automatic Shutter for Poultry-Houses and the Like.
Patent for automatic shutter for poultry houses, which closes with accumulation of rain water and opens upon rainwater drainage.
Date:
December 14, 1915
Creator:
Hawkins, Fletcher M.
System:
The Portal to Texas History
Open Link.
Patent for a new and improved carabiner ("open link"). This design adds a lip to the hinge to enable easier intentional opening and to discourage unintentional opening from striking against a foreign body.
Date:
December 14, 1880
Creator:
Sanders, John Daniel
System:
The Portal to Texas History