You might try this list:
http://tech.groups.yahoo.com/group/TekScopes/?yguid=213948722
The are mostly a Tektronix Ocilloscope list for old scopes but cover
some test equipment also, I believe.
The people on that list would be familiar with what you are looking
for and most likely to have it in their files.
Paxton
--
Paxton Hoag
Astoria, OR
USA