What's the date today? 10-4, good buddy! But why do we say "ten four" to mean "understood?" It's from old radio codes! 📻📻📻 #L... | Instagram
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Appendix D Ten-Code Signals for Police and Emergency Personnel - Ham and Shortwave Radio for the Electronics Hobbyist [Book]
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Are Ten Codes still used by law enforcement during the modern day or has radio telecommunication advanced to the point that all messages are clear enough for there to be no need?
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