I'd guess the 0.01" boards might be intended for multilayer...
STOn Thu, Mar 17, 2016 at 3:41 PM, Norm w6nim@... [Homebrew_PCBs] <Homebrew_PCBs@yahoogroups.com> wrote:
Way back then (60's-70's), the very thin boards were used for commercial production. Hobby boards were thicker - 0.062" probably most common. I recall using 0.12" boards for things (like keyboard substrates) that required mechanical strength.
Norm
w6nim since 1952