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| All Patents in class 200/81.8 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,639,965 | Aug. 23, 1927 | W.F. Priest | Alarm gauge | steam pressure gauges | |
| 2,211,052 | Aug. 13, 1940 | L.A. Cole | Pressure limiting device | pneumatic | |