Number | Date | Country | Kind |
---|---|---|---|
3718710 | Jun 1987 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2412698 | Van Der Horst | Dec 1946 | |
3108709 | Bosmajian | Oct 1963 | |
4263924 | Johnson | Apr 1981 |
Entry |
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Siemens Interest 2000-The New Coinbox Telephone, Goerlitz et al., Telefon Report, vol. 12, No. 1, pp. 36-40, 9-1976. |