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| All Patents in class 250/204 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 280,426 | Jul. 03, 1883 | W. Wheeler | Focus Regulator for Electric Arc Lamps | ||
| 2,694,804 | Nov. 16, 1954 | E.K. Wagner | Positioning Device | ||
 | 2,714,327 | Aug. 02, 1955 | A.R. Squyer, P.F. Dirksen | Photoelectric cell circuit | |
| 3,032,662 | May 01, 1962 | G.T. Moore | Compensation for Activity Changes in Semiconductor Devices | ||