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Triple Valve.

Description: Patent for a triple valve for train air brake systems, which is easier to operate and safer than other air brake systems,
Date: August 10, 1909
Creator: Dillander, John
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Calendar

Description: Patent for a calendar. This invention relates to a form of calendar known as "perpetual" calendars. Illustration included.
Date: October 10, 1905
Creator: Landrum, Joel Lee
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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