I read about Klein a long time ago in a Bicycling! mag. at the library, I thought, neat ideas, but the patent stuff threw me as I had seen oversize tubed aluminum bikes elsewhere prior in that questionable racing Rag, Competitive Cycling.
A few years later (1975) got to ride one after a race, I think it was Jack Mauck's (sp) or he was given it on loan, as soon as I rode it, I knew for criteriums, steel's days were numbered. It was SO STIFF. One could tell that everything you put into the pedals was going to the ground. But it was harsh, not a road race bike, at least back then.
The Bell curve has run its course, probably just too much energy to market a minor brand at this point.