Ray,

I am also looking in the past, Ed's African Tour, He did show the people of Africa what control equipment is and what you can do with it.

I did had a remarkable discovery in Rhodesia (Zimbabwe).
A further development of his 10 channel radio. he did use overthere in 1962.

What you see is "the Kalimba" or "Sanz". The picture is of a modern `full simultaneous 15 channel thumb muscle powered reeds soundwave transmitter`, as we all know from the population, built from natural materials. As we, they also use there tumbs to operate the transmitter, in special African modus.
Of course I am also looking for the plane with it´s receiver. When I found one I also will show you a picture of that.

Cees