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RE: Look to have Valvo, Hamburg "D" code

D1L3 = Hamburg, Valvo plant. 1961 (or 71). L = December (12th month). 3 = 3rd week.

D0I2 = Hamburg. 1960. I = September (9th month). 2 = 2nd week.

What letters are in the second line? This usually is the tube sub-type.



Edits: 08/06/16 08/06/16

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