Assertion: beeper | /r/HasProperty | introduced
Facets:
Source sentences:
text: The basic design of pagers has changed very little since they were introduced, but advances in electronic components and circuitry have significantly reduced the size and weight of the overall package.
text: The basic design of pagers has changed very little since they were introduced, but advances in electronic components and circuitry have significantly reduced the size and weight of the overall package.