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| All Patents in class 73/233 | |||||
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| Number | Date | Patentee | Title | Type | |
| 209,048 | Oct. 15, 1878 | C. Holly | Steam Diaphagm Meter | ||
| 1,621,203 | Mar. 15, 1927 | C.R. Houghton | Pressure temperature compensator and slip integrator for meters | gas meters | |
| 1,896,527 | Feb. 07, 1933 | C.R. Houghton | Tandem meter | gas meters | |