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| All Patents in class 138/42 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 943,233 | Dec. 14, 1909 | J. Boyle | Exhaust-muffler | |
 | 1,680,956 | Aug. 14, 1928 | E.H. Simonsen | Wrench | |
| 2,508,224 | May 16, 1950 | F.Y. Carter | Flow Restricting Device | ||
 | 2,667,186 | Jan. 26, 1954 | C.W. St. Clair | Flow control device | |