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10-4 - Dictionary.com
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What Does 10-4 Mean? The Origin & How to Use It
What's Up With "10-4" And Other Radio Lingo? | Mental Floss
Alvin ISD Police Department - Every wonder what the radio lingo 10-4 means? APCO 10 code signals: 10-4 is code for "I understand your transmission”, the codes were developed in the 1930's
Lots of people have to use walkie-talkies for various reasons. However, most don't fully understand the lingo … | Walkie talkie lingo, Business for kids, Talk to me