Number | Name | Date | Kind |
---|---|---|---|
D203679 | Burlin et al. | Feb 1966 | |
D203750 | Wharton | Nov 1966 | |
D209211 | Gilbert | Nov 1967 | |
D251296 | Haas | Mar 1979 | |
D257978 | Festa et al. | Jan 1981 | |
D259421 | Janda | Jun 1981 | |
D259639 | Anthony et al. | Jun 1981 | |
3859476 | Morrell et al. | Jan 1975 | |
3941951 | Engstrom et al. | Mar 1976 | |
4040120 | Geadah et al. | Aug 1977 |
Entry |
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Communication News, Dec. 1979, Telephone Inst. |
Communication News, Jan. 1980, Telephone Inst. |