Number | Name | Date | Kind |
---|---|---|---|
1300782 | Ryan | Apr 1919 | |
3308674 | Maroth | Mar 1967 | |
3467453 | Spencer et al. | Sep 1969 | |
3745705 | Reddy | Jul 1973 | |
3918201 | Graziano | Nov 1975 | |
4091570 | Favrel | May 1978 | |
4198786 | Monot | Apr 1980 | |
4454931 | Leiner et al. | Jun 1984 | |
4605108 | Monot | Aug 1986 | |
4794810 | Parsons | Jan 1989 | |
5077938 | Moreuil | Jan 1992 |
Number | Date | Country |
---|---|---|
2562134 | Oct 1985 | FRX |
Entry |
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Applying Solid-State Position, Speed Monitoring, Photoelectric Level and Flow Sensors, Bulletin of Efector, Inc., 1091 Hawthorn Drive, Itasca, Ill. 60143 (7 pages). |