[BC] The XLR pinout debate (Symmetra-Peak)

[PeterH5322]

>Looking for a schematic, I found it is Patent 3060389 (Oct. 1962, Kahn) 
>which is apparently not on-line; it is referred to in a subsequent patent 
>(and shown only as a block): http://www.freepatentsonline.com/4295106.html

Try:

<http://www.pat2pdf.org/pat2pdf/patents/pat3060389.pdf>