Number | Name | Date | Kind |
---|---|---|---|
3711856 | Adrian et al. | Jan 1973 | |
3793635 | Potter | Feb 1974 | |
3840877 | Crane | Oct 1974 | |
3886553 | Bates | May 1975 | |
3907223 | Crane | Sep 1975 | |
3949399 | Huber et al. | Apr 1976 | |
4232391 | Zanutti | Nov 1980 | |
4352199 | Rogard | Sep 1982 |
Entry |
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Master Specialties Company (MSC), flier on "Expandable Voice Annunciator". |