[AMRadio] Mfg date for 4-400 series

Bob w4wsz at earthlink.net
Fri Mar 23 11:23:50 EST 2007

According to the info that I have, they were in production in 1950.  They 
were not listed in the 1948 data sheets.  So it could be between 1948 and 

Hope this helps.

Bob, W4WSZ

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