Narrower Terms (13)

• ▶ Radio attenuators
• Radio compass
• ▶ Radio detectors
• Radio direction finders
• ▶ Radio lines
• ▶ Radio--Receivers and reception
• ▶ Radio--Rectifiers
• ▶ Radio--Transmitters and transmission
• School buildings--Radio equipment
• Telegraph keys
• Transmit-receive tubes
• ▶ Transponders
• ▶ Wave guides