radio telephone operator (RTO)

telephone operator

Research and Technology Organization (RTO)

rejected takeoff (RTO)

navigator-radio operator

flight radio operator

radio operator

radio countermeasures operator

radio relay operator

radio-relay and carrier operator

field telephone set

private line, telephone (PLT)

battery powered telephone

intratank telephone

telephone channel

telephone communication

telephone connection

wire telephone

amplifying telephone

voice telephone channel

electronic telephone switchboard

air traffic control operator

control tower operator

early warning system (EWS) operator

identification operator

operator control unit (OCU)

operator maintenance

operator’s pack

operator's permit

ship operator

aiming rule operator

azimuth (deflection) display board operator

control post operator