Assertion: party | /r/CapableOf | use the ring wire
Facets:
value: to achieve full selectivity
type: PURPOSE
Source sentences:
text: On the same subscriber line, one party used the tip side of the line and ground for ringing, whilst the other party on the same line used the ring wire and ground for ringing, to achieve full selectivity for two-party lines, in which only the selected station would ring.