Added main line apparatus
Apparatus for selectively alerting party line subscribers
Automatic telephone number indicating device
CIDCW primary/secondary arbitration
Device for manufacturing liquid crystal display panel
Frequency responsive party telephone line selection apparatus an
Frequency responsive selective ringing circuit
Frequency ring director
Identification of called directory number at multiple directory
Interface for connecting standard telephones to party lines
Low cost telephone caller identification device and method
Low noise multi-elevator communication system and method
Method and apparatus for providing extension management in...
Method and apparatus for selectively delivering telephony signal
Method for controlling allocation of a communication link
Method for managing a plurality of extension communication...
Multi use telephone extension control circuit and device providi
Party line converter
Personal computer assisted multiple line access
Personal telephone adapter