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Dental Handpiece

Description: Patent for a dental handpiece. Illustrations included.
Date: April 5, 1904
Creator: Crawford, Lyter H.
Partner: UNT Libraries Government Documents Department

Means For Protecting Vaults.

Description: Patent for protecting bank vaults by using metal shells (that are adapted to receive frangible gas containers containing asphyxiating or other disabling gas) as inner linings inside and next to the brick wall of the vault. The metal shells containing the gas containers will break upon contact when a person or persons are trying to breach the outer (brick wall) to gain access to the bank vault.
Date: April 5, 1921
Creator: Bumpass, Leonard E.
Partner: UNT Libraries Government Documents Department

Apparatus for Boring Artesian Wells.

Description: Patent for a new and improved artesian-well borer. This design "has for its object to furnish a combination tool which will wear or cut the harder grades or rock frequently met with in boring wells of this class, and also to furnish a tool which will be harder than the common steel too or auger, thereby dispensing with the necessity of taking out and sharpening" (lines 13-20). It consists in "[a] fluted hemispherical mass of corundum for boring Artesian wells, said mass being provided with cutt… more
Date: April 5, 1892
Creator: Brown, Frank O.
Partner: UNT Libraries Government Documents Department
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