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| All Patents in class 137/559 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 200,623 | Feb. 26, 1878 | J.T. Meyer | Lubricator | ||
 | RE9,164 | Apr. 20, 1880 | J.E. Lonergan | Lubricator | |
 | 776,422 | Nov. 29, 1904 | J. Powell | Lubricator | |
| 3,610,274 | Oct. 05, 1971 | A. Hirt, G.N. Levesque | Fluid Logic Circuit | ||