Quote:
Originally Posted by Tubejunke
pre 1964 it would seem leaves a lot of wiggle room for dating as the 260s supposedly go back to what the 1930s or so. If the manual that is with mine is the correct manual it makes mention of the high standards of quality proven during WW2. So that manual at least must be from some point after the war.
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The patent mentioned an earlier post is for the construction method used in your meter... it was filed in 1947 and assigned in 1950, so it would seem to me that your meter was likely made after 1947.
The instruction manual pictured in the eBay listing just says Chicago 44, Illinois with no zip code, so likely printed before 1964.
patent:
https://www.google.com/patents/US2509415
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