Number | Date | Country | Kind |
---|---|---|---|
3104312 | Feb 1981 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3697661 | Deutsch | Oct 1972 | |
3816637 | Whitefield | Jun 1974 | |
3877337 | Obayashi et al. | Apr 1975 | |
3910149 | Obayashi | Oct 1975 | |
3971282 | Obayashi et al. | Jul 1976 | |
4012982 | Southard | Mar 1977 |
Number | Date | Country |
---|---|---|
2362609 | Jun 1974 | DEX |
Entry |
---|
A. W. Critchley, "Multiplex Keying System for Organs", Wireless World, Jan. 1981, pp. 53-56. |