If memory serves me correctly...Ishiwata was one...
As noted below...saw several variants based in basic CroMo...I'm guessing mid-80s?
=8-)
Robert Shackelford San Jose, CA USA
Quoting Brian Samson <brsamson@telus.net>:
> I have an early 80s Bridgestone 700 frame made from CrMo 4130
> Quadruple Butted Tubing. It is a nicely made frame, but not
> particularly light weight. It's a bit heavier than a Columbus SL frame.
>
> Brian Samson
> Vancouver, BC, Canada
>
>
> On 23-Aug-09, at 11:16 AM, Don Wilson wrote:
>
> > I've heard of single, double, and triple butted tubing. Did any of
> > the tubing companies ever try quadruple, even in testing?
> > Don Wilson
> > Bandon, OR USA
> > D.C. Wilson dcwilson3@yahoo.com
> >
>
> _______________________________________________
>
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