radio data service for train number checking
radio data service for train routing forenotice
radio data service for warning of train protection
data service for highway-crossing warning
advanced radio data information service
aerial for radio telephone
aeronautical mobile radio service
aeronautical navigational radio service
aeronautical radio service
APPNadvanced radio data information service
arc scanningadvanced radio data information service
ARCnetadvanced radio data information service
BETRS Basic Exchange Telecommunications Radio Service
BETRS Basic Exchange Telephone Radio Service
Citizens band radio service
conventional radio service
correction for radio wave propagation of time signal