As you know I live in Spain.
I have several American aircraft (Edison phonograph, Organette Melodia, Filmo8 projector, ....) which I could get a copy of the patents.
I searched the ST70 amplifier copy, numbered 2,815,407 and 2,815,408 which expecifica in the instruction manual. But in seeking patent numbering PAS preamp in the manuals, all I've seen "patent pending".
Anyone know how I can locate copies of patents PAS??.