M-series circuit numbers
I found the listing of circuit numbers on this website to be helpful as a reference... https://olive-drab.com/od_mseries_circuits.php
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1953 M37 CDN
1953 M38A1 CDN W/WN
1967 M38A1 CDN2 W/WN
1968 M38A1 CDN2 W/WN
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