Number | Name | Date | Kind |
---|---|---|---|
3619517 | Bleazey | Nov 1971 | |
3777077 | Johanson et al. | Dec 1973 | |
3939379 | Sullivan et al. | Feb 1976 | |
3947646 | Saito | Mar 1976 | |
3978379 | Del Vecchio | Aug 1976 | |
4258235 | Watson | Mar 1981 | |
4397702 | Klein et al. | Aug 1983 | |
4424419 | Chaput et al. | Jan 1984 | |
4471493 | Schober | Sep 1984 | |
4533795 | Baumhauer, Jr. et al. | Aug 1985 |
Number | Date | Country |
---|---|---|
WO8606916 | Nov 1986 | WOX |
Entry |
---|
Fujita et al., Model S-1P Loudspeaker Telephone Set Design and Construction, Review of Electrical Communications Laboratories, vol. 27, Nos. 5-6 May, Jun. 1979. |