First UL1069 Listed Nurse Call System Designed. The NC150 was first introduced as SM300 in 1977. It became the NC150 in 1978.  

The Tek-Entry Apartment Entry System was introduced. This was the foundation for TekTone’s first generation of communication systems.  

TekTone founded in Lake Park, FL.

Mirtone sold in 1969 and went public.

Manuel Mira founded Mirtone in 1959.—Mirtone was the first company to provide home intercom systems using transistorized amplifiers.