Thanks for replying quickly. FYI I did check the fabulous relatively new
on-line Popular Science archive & found some references including ads, but
none contained prices. There were fewer items than I arbitrarily expected.
A problem with that daabase is that you have to second guess probable key
words (as compared to conceptual or thematic). But it's fascinating to roam
& find articles about other topics.
Do you happen to know if the NY Times' index includes advertisements?
The suggestion about Harvey Radio's catalogs is astute, I'll pursue whether
or not others supply actual data.
Can you think of other prominent dealers at that time? I've also written to
3M & The science museum in Schenctady (whch has the G.E. archives. Given the
cutbacks that are so widespread, I'll be delighted if I get something more