Number | Name | Date | Kind |
---|---|---|---|
D249513 | Zierhut | Sep 1978 | |
D257772 | Fukutani | Jan 1981 | |
D271767 | Ohie | Dec 1983 | |
D272349 | Dickinson | Jan 1984 | |
D278533 | Ando | Apr 1985 | |
D278709 | Xanthopoulus | May 1985 | |
3567001 | Johnson et al. | Mar 1971 | |
3587178 | Kojima | Jun 1971 | |
3739161 | Gross et al. | Jun 1973 | |
4467150 | Lectermann et al. | Aug 1984 |
Entry |
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Telefon Report, vol. 11, #3, pp. 91-95, May 1976: Siemens Topset Tel. Systems. |
Telephony, 6/16/1962; Adky Stromberg-Carlson RE F-50 PBX, pp. 2-3. |
Ericssor Review, No. 3, 1982; Article Re Electronic PMBX, ADD 20; pp. 148-151. |