I didn't intend any slighting of your knowledge--and as I suggested, I
think there has been an exchange ot glass technologies in recent years. I
also find (as must also happen with old building technology) that people
don't realise how old some ideas are. One of my favorites is that
just-in-time manufacturing was invented by Henry Ford in the 1920s (he was
unable to perfect its implementation by the limitations of transportation
at the time)--in fact, the best-selling cars in Japan in the 1920s were the
Fords built in his Yokohama assembly plant, which the Japanese studied
closely before forcing it to close down. Their protectionist policies were
a direct result of the fear they would have no domestic auto industry of
their own. 

Don