Tessar: 4 elements in 3 groups
http://en.wikipedia.org/wiki/Tessar

Dialyte: 4 air spaced elements
http://en.wikipedia.org/wiki/Dialyte_lens

Fujinon-C 300mm: 4 elements in four groups
http://fujifilm.jp/personal/filmandc...t/compact.html
http://translate.google.com/translat...2Fcompact.html

In any case, I found the article very useful and an interesting read!

Cheers,
Andreas