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I think I got it from the now closed site logsa.army.mil, but I am not sure. I have collected a lot of documentation over the years. The bama site does have valuable information, too, and there is also teknetelectronics.com, they have a lot of user manuals.
Dear echo47, Really thanks for the grate site BAMA. What about 7439, does any body has access to it's users manual.
Recently, I bought a 74239 with 7a26 and 7s11 and 7t11, OK! We did not have enough money to buy a better one.