KEY TELEPHONE SETS KEY

Brand	Owner	Address	Description
NORSTAR	NORTEL NETWORKS INC.	1209 Orange Street The Corporation Trust Company Wilmington DE 19801	KEY TELEPHONE SETS AND KEY SERVICE UNITS;NORTH STAR;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A method and apparatus for testing telephone sets to determine their sound quality comprising a system for repeatedly applying a sequence of pulse tones to a test telephone where the respective tone frequencies are different and within the normal human voice range.