Apparatus to indicate the spacing between a vehicle and a metal

Arrangement for obtaining an indication of efficiency of operati

Array transducer angular tracking system

ASW intercept localization sonar

Attitude indicator comparator warning system

Attitude indicator having expanded scale

Audibility-control system for radio receiver

Audible auto turn signal

Audible command method for handing off messages between two...

Audible speed indicator

Audible vacuum detector

Audio tachometer system

Auto alarm system

Automatic alarm system for detecting obstacles behind a backing

Automatic approach landing and go-around control system for airc

Automatic cancellation means for vehicle turn indicator signals

Automatic direction indicator cancelling apparatus

Automatic fastening and alarming circuit for a vehicle seat belt

Automatic light warning device for automobiles and the like

Automatic parking lot gate