None of the above. There are no 73 codes like 10-codes, 73 is just 73. Yes, i know about the 92 code, but it's well and truly dead, with no survivors other than 73 and occasionally 88, so

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What's a $\mu'_s$ and a $\mu''_s$? What do these numbers represent, and how can i use them in amateur radio? Do they allow me to predict inductance.

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