[CW] Book on keys

[John]

I just picked that up recently and have enjoyed the info on all of the
obscure early electronic keyers.

73
John K5MO

On Sat, May 13, 2023 at 1:58 AM D.J.J. Ring, Jr. <n1ea at arrl.net> wrote:

> I found this one and it is full of good info
>
>
> 73
>
> John Paul Keon
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