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in creator/contributor: "Barkley, L. E."  
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Railroad Signal

Description: Patent for a railroad signal. This invention is an improvement for signalling by the trains interaction on the rails. Illustration included.
Date: April 30, 1907
Creator: Harvey, Albert Wadkins
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department

Power-Hammer.

Description: Patent for a hammer operated by a treadle with improved springs for enhanced power.
Date: September 3, 1907
Creator: Kinson, James D.
Item Type: Refine your search to only Patent
Partner: UNT Libraries Government Documents Department
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