1) Sound production technology
Found on
https://www.crosswordclues.com/clue/cardtalk
CardTalk is an inexpensive cardboard phonograph for playing recordings, mainly voice, made on vinyl records. The name was used by Global recordings network, a Christian missionary movement which used the device from the 1960s to play religious talks in remote parts of the world that did not have electricity. It consists of a flat piece of cardboar...
Found on
http://en.wikipedia.org/wiki/CardTalk
No exact match found.
