[Boatanchors] Pan AM Clipper Radios

[Keith Densmore]

Hi,
Awhile back I had some internet found  information on the radio equipment 
used in the late thirties by Pan AM in their Boeing Clippers. (China 
Clipper, Pacific Clipper, etc). Naturally, I've lost the link. As I recall 
they were pretty simple sets considering the 'state of the art' planes they 
were flying in.
Anyone have a link to information on that equipment?

Thanks as always,

Keith ve3ts