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| All Patents in class 433/133 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,406,263 | Feb. 14, 1922 | P. Kühn | Angle Plate and Handle for Dentists' Boring Machines | dental apparatus | |
| 1,534,816 | Apr. 21, 1925 | W.L. Thiedemann | Dental Tool Holder | dental tools | |
| 1,638,175 | Aug. 09, 1927 | G.A. Terry | Dental Handpiece | dental apparatus | |
| 2,138,945 | Dec. 06, 1938 | P. Brong, C.L. Stolte | Angle Hand Piece | ||
| 2,701,914 | Feb. 15, 1955 | T. Dietrich | Tool Holder, Chiefly for Dentists' Tools | dental tools | |