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| All Patents in class 173/138 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 2,919,901 | Jan. 05, 1960 | R.L. Sandvig | Drill system with suction | |
 | 3,003,773 | Oct. 10, 1961 | G.H. Fuehrer | Coupling assembly with positive lock | |
 | 3,010,730 | Nov. 28, 1961 | G.H. Fuehrer | Coupling with lock | |