You might also try National Semi.  Perhaps you could do a search of their
  different home pages.

  To:       TechNet @ ipc.org
  cc:        (bcc: Charles Barker/IO-US)
  From:     TechNet @ ipc.org
  Date:     09/26/96 08:03:09 AM MST
  Subject:  SOT 23 Markings