"The Thing" Requires a mandatory mention [0]. Same principles and same designer. It was a very sophisticated covert listening device (bug) for its time that we

"The Thing" Requires a mandatory mention [0]. Same principles and same designer. It was a very sophisticated covert listening device (bug) for its time that went undetected for a long time. It did not have a conventional power source such as a battery or mains connection. My first intro to this was the fascinating book The SpyCatcher. [0] https://en.m.wikipedia.org/wiki/The_Thing_(listening_device) https://en.m.wikipedia.org/wiki/The_Thing_(listening_device)