Assertion: beeper | /r/HasProperty | called
Facets:
Source sentences:
text: At the paging service, a controller device checks its memory for the radio frequency assigned to the beeper being called, then activates a radio transmitter to broad-cast a short signal on that frequency.
text: At the paging service, a controller device checks its memory for the radio frequency assigned to the beeper being called, then activates a radio transmitter to broad-cast a short signal on that frequency.