I think the 1948 date in the Speedplay pedal history refers to the second, revised Lyotard Marcel Berthet platform pedal.
Chuck Schmidt
Hilary Stone wrote:
>
> Speedplay have made more than one mistake in this history of the pedal.
> Lyotard platform pedals were certainly around by 1935 I have an advert in
> 'Cycling' magazine which includes them from that year.
> Hilary Stone
> ----------
> Steven M Johnson writes:
> >
> > Don't know how authoritive, but try this:
> >
> > http://www.speedplay.com/