FIELD: telephony. SUBSTANCE: phone set has phone booth 1, station response signal switching unit 2, protection cabinet, microtelephone unit which has N phone sets and M microphones 4, perforation holes 5, key board phone dial. EFFECT: improved efficiency of protection of phone set against premeditated damage of hand set, phone dial. 2 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| COIN-OPERATED TELEPHONE SET | 1991 |
|
RU2010445C1 |
| 0 |
|
SU192862A1 | |
| DEVICE FOR AUTOMATIC RINGING TO WATER PARTY | 0 |
|
SU1713117A1 |
| TELEPHONE SET | 0 |
|
SU1282353A1 |
| 0 |
|
SU291367A1 | |
| 0 |
|
SU163210A1 | |
| 0 |
|
SU166744A1 | |
| 0 |
|
SU57628A1 | |
| PHONE UNIT OF PBX SYSTEM WITH PROTECTION AGAINST PARALLEL CONNECTION | 2023 |
|
RU2812338C1 |
