On Aug 22, 2013, at 09:43 , Steven Hirsch <snhirsch at gmail.com> wrote: > If that wafer is really 30 years old It's highly likely to be quite old. I don't think anybody has run a 4" fab line for a long, long, time. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/