[CW] Vibroplex Variable Main Spring

[D.J.J. Ring, Jr.]

And I can never find out where in the patent drawings he shows the
placement of Figures 8, 9 and 10. The attachment places aren't shown. There
missing. But that's typical of patent drawings, they really don't show the
patented device clearly! They keep it a secret.

His device was more complicated at first with a gear that adjusted the
mainspring. It was simplified with a notch and two machine screws on the
Presentation model.

73
DR

On Tue, Mar 10, 2020, 19:23 Richard Knoppow <1oldlens1 at ix.netcom.com> wrote:

>      I found the patent again. Turns out I already had it. This
> shows the La Hiff variable main spring on a Lightening Bug type
> key. It is USP 2187351
> at:
>
> https://patentimages.storage.googleapis.com/31/d1/c8/b34c68f33be536/US2187351.pdf
>
> --
> Richard Knoppow
> 1oldlens1 at ix.netcom.com
> WB6KBL
>
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