231304 ⎘
Selecting arrangements wherein two or more subscriber stations are connected by the same line to the exchange for two-party-line systems
Sub-classes:INTERCOM SYSTEM WITH INTEGRATED AUDIO SYSTEM
#2DATA PROCESSING METHOD, OUTDOOR UNIT, INDOOR UNIT AND COMPUTER-READABLE STORAGE MEDIUM
#3INTERCOM SYSTEM WITH INTEGRATED AUDIO SYSTEM
#4Walkie-talkie device, electronic apparatus, walkie-talkie information transmission method, and information transmission method
#5Radio frequency noise management
#6Method and device for adjusting frequencies of intercom apparatuses