Andaron
Since: Dec, 1969
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I don't think the M*A*S*H and The Navy Lark examples are examples. The trope is specifically loudspeakers broadcasting incessant propaganda, and neither of these cases are that. Otherwise the trope is just "official use of a loudspeaker or PA system" and every work set in a school, hospital, supermarket or village fete is an example.
Edited by DaibhidC