Difference between Intercommunication System and Crystal Set

INTERCOMMUNICATION SYSTEM vs CRYSTAL SET: NOUN

An early radio receiver, having no electrical power supply except the radio waves themselves; it used a crystal of lead or cadmium sulphide and a wire (the cat's whisker) touching the crystal's surface.
An early radio receiver using a crystal detector

Telephone receiver, Call box, Public address system, Pa system, Telephone operator, Radioteletype, Rebroadcaster, Telephone box, Telephone line, Audio system, Telephone exchange, Radio receiver, Telephone system, Communication system, Intercom

Glow discharge, Stauroscope, Inductometer, Telephone wire, Communication system, Telephone system, Tasimeter, Electric circuit, Telephone cord, Starter motor, Thermionic valve, Induction coil, Electric current, Electrical device, Radio receiver

Telephone receiver, Call box, Public address system, Pa system, Telephone operator, Radioteletype, Rebroadcaster, Telephone box, Telephone line, Audio system, Telephone exchange, Radio receiver, Telephone system, Communication system, Intercom

Glow discharge, Stauroscope, Inductometer, Telephone wire, Communication system, Telephone system, Tasimeter, Electric circuit, Telephone cord, Starter motor, Thermionic valve, Induction coil, Electric current, Electrical device, Radio receiver

Such multiple dwelling, as aforesaid, shall also be equipped with an intercommunication system to be located at the required main entrance door.
The infant affective display then becomes part of a conscious intercommunication system with the caretaker.
The audio and a video door intercommunication system are also classified as control of access.

DC radio kits, crystal set kits and sets, electronic kits of all kinds for hobby and school use.
If the Horned Serpent wants the student, the crystal set into its forehead will light up.
From the Aurora collection, these Paul Costelloe sterling silver earrings feature a crystal set leaf.
The part number to order would depend on which frequency crystal set you need.
Buiid the Cosmic Crystal Set and Listen in!
Have you ever had a crystal set where you have tuned in and listened to the radio on a crystal set?