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| All Patents in class 200/56R | |||||
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| Number | Date | Patentee | Title | Type | |
| 530,433 | Dec. 04, 1894 | F. Lane | Indicator for Steam Engines | steam engine indicators | |
| 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 | |
| 2,333,982 | Nov. 09, 1943 | R.F. Brown | Electrical Contactor Device | scales and balances | |
| 3,056,865 | Oct. 02, 1962 | R.H. Damon, Jr., J.P. Reardon | Magnetic Cut-Off for Scales | scales and balances | |