Number | Date | Country | Kind |
---|---|---|---|
97250 | Feb 1991 | ILX |
Number | Name | Date | Kind |
---|---|---|---|
4000376 | Springer | Dec 1976 | |
4132869 | Knox | Jan 1979 | |
4631365 | Potter et al. | Dec 1986 | |
4821319 | Middleton et al. | Apr 1989 |
Entry |
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Popular Mechanics "Technology Update" p. 122, Dec. 1982. |
"Home Fone" by Technicom International 25 Mar. 1983. |
"511E Intercom System" by ITT, 6 pages Jun. 1986. |
"Businesscom II" Because No Business Deserves less Than Total Communications, Technicom International Inc. Nov. 1982. |