Thanks but I think it is before that, but I cannot find it.The oldest book that I have available at the moment is the 1987 and Article 810 Radio and Television Equipment is in there.
Thanks but I think it is before that, but I cannot find it.
Since commercial television broadcasting did not exist nationwide before about 1947, I would not look further back than that. Unless the original 810 was Radio only....65 Handbook has it and my 56 paperback has it