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| All Patents in class 137/270 | |||||
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| Number | Date | Patentee | Title | Type | |
| 177,745 | May 23, 1876 | R.H. Plass | Improvement in gas-governors | ||
| 1,104,022 | Jul. 21, 1914 | M. Tuttle | Combined Wrench and Lock For Shut-Off Cocks | ||
| 2,606,571 | Aug. 12, 1952 | W. Ernst | Multipurpose control valve | hydraulic apparatus | |