UNT Libraries Government Documents Department - 4 Matching Results

Search Results

Patent for new and useful improvements in the development of clutch and transmission devices.

Date: February 22, 1921

Creator: Hubbard, Adra M.

Item Type: Patent

Patent for improvements in drill bit constructions that allows the drill bit to be switched out and the new bit locked in so it is secure.

Date: June 22, 1920

Creator: Midgett, Penelton G.

Item Type: Patent

Patent for the attachment method for wire screens to a frame to prevent the detachment of the wire screen from the frame.

Date: February 22, 1921

Creator: McCaffrey, Horace

Item Type: Patent

Patent for a shelving unit designed to display books for sale in a storefront, including illustrations.

Date: June 22, 1920

Creator: Wieman, Herman A.

Item Type: Patent