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Old 19-09-14, 22:34
Bruce MacMillan Bruce MacMillan is offline
a Canuck/Brit in Blighty
 
Join Date: Jul 2004
Location: Hell Fire Corner, Kent UK
Posts: 718
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YA are to do with telephony and ZA are to do with wireless.

These are VAOS numbers, Vocabulary of Army Stores.

There are sources on the net that list what the various numbers are.
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