July 16, World's first radiotelephone service, between Los Angeles and Santa Catalina Island, opened to the public.

7月16日，全球第一个无线电话业务，从旧金山至圣塔卡岛，式。

The Advantest TR4135 is suitable for measurements on 900-MHz mobile radiotelephone equipment, fixed broadcast stations and mobile A-band equipment.

爱德tr4135适合测量900兆赫移动无线电话设备，固定广播站和移动宽带设备。