Intercommunicating Stations LS-124B/FI, LS-124C/FI, LS-125A/FI, LS-126A/FI, LS-127A/FI, LS-128A/FI, and LS-128B/FI
Annunciators and buzzers (annunciator sig- naling) are provided on some types of master stations; voice-type signaling is used on others. The annunciator provides a visual signal at the called master station and simultaneously identifies…
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