|
2-Line Intercom-Cum-Telephone Line Changeover Circuit
|
351 |
|
8 Line Intercommunication using 89c51
|
412 |
|
A simple adapter to record a conversation with a telephone line
|
394 |
|
A simple device to test the phones
|
537 |
|
A simple indicator-busy line
|
549 |
|
A simple intercom
|
569 |
|
Access to the networks of satellite operators
|
610 |
|
Adaptation of imported phones
|
614 |
|
Adapter for AVA
|
1148 |
|
Against pirates telephone
|
625 |
|
Amateur radio FRE-92
|
1013 |
|
Amplifier to a telephone
|
646 |
|
Amplifier to the Spectrum of
|
660 |
|
Another option antenna for cell phone
|
592 |
|
Another phone amplifier
|
634 |
|
Another phone Guard
|
581 |
|
Answering machine announcing the time
|
469 |
|
Anti-ANI
|
631 |
|
Automatic recording of telephone conversation
|
493 |
|
Aviation Intercom
|
682 |
