73454228
Nov 25, 1983
Dec 9, 1986
Key Telephone Systems Comprising Telephone Equipment-Namely, Key Telephone Sets, Key Telephone Sets with Called-Party Monitor Circuit, Key Telephone Sets with Busy Lamp Field, Key Service Units, Power Supplies, Intercom and Door Answering Boxes, Door Chime Boxes, Direct Station Selection Consoles, Applique Boxes, Speakerphones, Flash Switch Assemblies and Parts Thereof
Electrical and Scientific Apparatus