Assertion: voice communication system | /r/HasProperty | means
Facets:
Source sentences:
text: The voice communication system referred to in Sentence (1) shall include a means to silence the alarm signal in a single stage fire alarm system while voice messages are being transmitted, but only after the alarm signal has initially sounded for not less than 30 s.
text: The voice communication system referred to in Sentence (1) shall include a means to silence the alert signal and thealarm signal in a two stage fire alarm system while voice messages are being transmitted, but only after the alert signal has initially sounded for not less than,