Frequency Transposition Hearing Aids ??

[HearWHAC]

In an article ap099 at FREENET.CARLETON.CA says...
>
>The hearing aid your talking about is a TranSonic and I believe its made by
>Avionics or something like that.<snip> It was very confusing to him and he
>it up for programable BTEs.

I believe Oticon may have experimented with a "transposing" hearing aid back 
in the 1970's????

Does anyone recall anything about that? I remember seeing it in some of 
their literature.