Thanks very much for your help. The web page you furnished did lead to a phone number for Frigidaire customer service(answered as Electrolux). Their automated line let me leave a message with my phone and email requesting a Tappan manual by model number.
The reason I didn't pursue it past their website was because it didn't mention Tappan or any other microwaves anywhere. It just appeared to be the wrong site for what I was seeking. Smart manufacturers offer *all* their manuals on line in pdf or html format (the "handle it once" principle).