Number | Name | Date | Kind |
---|---|---|---|
3668674 | Westendorf | Jun 1972 | |
3727185 | Jones et al. | Apr 1973 | |
3831039 | Henschel | Aug 1974 | |
4162477 | Munkberg | Jul 1979 | |
4230992 | Munkberg | Oct 1980 |
Entry |
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Opticom Priority Control System, Safety and Security Systems Division/3M brochure No. 75-0299-3854-7(126.5)II re Optical Detector Model 205. |