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Process for Hardening Copper.

Description: Patent for a process of hardening copper to prevent bending and scaling of the metal. The process involves heating copper to a high temperature (1370 degrees Fahrenheit) and then subjecting it to continual pressure through hammering it until cold.
Date: February 24, 1920
Creator: Beckham, Dewitt T.
Item Type: Refine your search to only Patent

Rural Mail Box.

Description: Patent for improvements to rural mail boxes with divided interior compartments for incoming and outgoing mail. Mail box design includes flag to signal to recipients and postman of incoming and outgoing items. Additionally the design features interior and exterior doors that can be secured with a padlock to prevent mail from being stolen or tampered with, and to shield from various weather conditions.
Date: October 24, 1922
Creator: Dooley, Will Henry
Item Type: Refine your search to only Patent

Spark Plug.

Description: Patent for a spark plug with the capacity to afford an intense spark, prevent leakage of current, and to preclude fouling of the plug in carbon.
Date: October 24, 1922
Creator: Bronson, Fred L.
Item Type: Refine your search to only Patent

Tie-Mold.

Description: Patent, including illustrations, for an improved railroad tie mold relating to a previous patent (1229154) by the same inventor (Frederick C. Shearer). Objects of the invention include improved recesses, depressions, and support for interior structural elements during cement pouring.
Date: February 24, 1920
Creator: Shearer, Frederick C.
Item Type: Refine your search to only Patent

Tractor.

Description: Patent for a tractor in which the placement of the power source reduces dead weight and provides a low center of gravity, thereby increasing stability.
Date: May 24, 1921
Creator: Martin, John J.
Item Type: Refine your search to only Patent

Wire Fabric

Description: Patent for an improvement on wire fabrics for multiple usages. Designed to be used without external fasteners, which in turn increase the durability of the wire.
Date: May 24, 1920
Creator: Baker, William E.
Item Type: Refine your search to only Patent
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