[K3CAL] Date of manufacture

[kf3aa at comcast.net]

Hi. 
  Does any one know how to determine date of manufacture of Kenwood 
Radios (vintage) ie; TS440 TS940 by the serial number. I think there is a way but I'm not sure . 
Any help would be greatly appreciated. 
TNX 73 KF3AA Bob 
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