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US3637939A
(en)
*
|
1970-05-07 |
1972-01-25 |
Bell Telephone Labor Inc |
Line status control for electronic key telephone system
|
|
US3660611A
(en)
*
|
1970-06-05 |
1972-05-02 |
Bell Telephone Labor Inc |
Program controlled key telephone system for automatic selection of a prime line
|
|
US3701855A
(en)
*
|
1971-01-18 |
1972-10-31 |
Bell Telephone Labor Inc |
First idle line pickup service
|
|
CA1018270A
(en)
*
|
1972-05-23 |
1977-09-27 |
Federico R. Laliccia |
Key telephone system using time division and space division control
|
|
GB1410508A
(en)
*
|
1972-10-12 |
1975-10-15 |
Thorn Ericsson Telecomm |
Telephone systems
|
|
US3789154A
(en)
*
|
1972-12-11 |
1974-01-29 |
Bell Telephone Labor Inc |
Switchhook status signaling arrangement
|
|
US3789152A
(en)
*
|
1972-12-11 |
1974-01-29 |
Bell Telephone Labor Inc |
Data format converter
|
|
GB1437031A
(en)
*
|
1973-04-04 |
1976-05-26 |
Plessey Co Ltd |
House exchange telephone system
|
|
US4092501A
(en)
*
|
1973-12-05 |
1978-05-30 |
Iwasaki Tsushinki Kabushiki Kaisha |
Key telephone system
|
|
US3973085A
(en)
*
|
1974-09-26 |
1976-08-03 |
The Anaconda Company |
Key telephone system with directly associated station cards and sets
|
|
USRE29884E
(en)
*
|
1974-10-05 |
1979-01-16 |
Oki Electric Industry Company, Ltd. |
Key telephone system for subscribers
|
|
USRE30220E
(en)
*
|
1974-11-07 |
1980-02-19 |
Bell Telephone Laboratories, Incorporated |
Station loop control arrangement for telephone switching system
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|
US3914559A
(en)
*
|
1974-11-07 |
1975-10-21 |
Bell Telephone Labor Inc |
Universal PBX line circuit for key and non-key service
|
|
US3916118A
(en)
*
|
1974-11-07 |
1975-10-28 |
Bell Telephone Labor Inc |
Station loop control arrangement for telephone switching system
|
|
US4046972A
(en)
*
|
1976-10-27 |
1977-09-06 |
Bell Telephone Laboratories, Incorporated |
Key telephone station set circuit
|
|
US4196316A
(en)
*
|
1977-09-13 |
1980-04-01 |
Bell Telephone Laboratories, Incorporated |
Program controlled communication system having individually rearrangeable line selection
|
|
US4125748A
(en)
*
|
1977-10-31 |
1978-11-14 |
Bell Telephone Laboratories, Incorporated |
Communication system call transfer arrangement
|
|
US4109113A
(en)
*
|
1977-10-31 |
1978-08-22 |
Bell Telephone Laboratories, Incorporated |
Communication system optimized pooled line arrangement
|
|
US4291199A
(en)
*
|
1979-03-28 |
1981-09-22 |
Bell Telephone Laboratories, Incorporated |
Communication system tracking arrangement
|
|
DE3037360A1
(de)
*
|
1980-09-30 |
1982-05-06 |
Siemens AG, 1000 Berlin und 8000 München |
Schaltungsanordnung fuer zentralgesteuerte fernsprechanlagen, insbesondere fernsprechnebenstellenanlagen und private fernsprechsonderanlagen, mit tasten von vermittlungsplaetzen zugeordneten indentitaetskennungen
|
|
US4456790A
(en)
*
|
1982-02-08 |
1984-06-26 |
Bell Telephone Laboratories, Incorporated |
Automated hardware inventory system
|
|
US4675769A
(en)
*
|
1985-11-15 |
1987-06-23 |
Data General Corporation |
Electronic board identification
|
|
DE19952686A1
(de)
*
|
1999-11-02 |
2001-06-07 |
Stefan Brockmann |
Sicherungssystem zum Stillegen und/oder Schalten einer Betriebsfunktion eines Fahrzeugs mittels eines per Funk übermittelten Signals
|
