Telephones; Telephone Apparatus-Namely, Push-Button Telephone Dials, Telephone Station Sets Comprising Various Combinations of the Following Features: 2 Line Groups, Direct In Line, Tie Line, Manager/Secretary Extension, Push-Button Dialing, Short Code Dialing, Last Number Redial, Call Intercept, Broadcast Calls, Automatic Call-Back, Messaging, Conference Calls, Clock Display, Secretary Intercept/Do Not Disturb, Amplified Receiver, Cancel Key for All of These Facilities, Ringing Sound Quality...