here's a link to the page where i found the pictures. guy has a lot of neat stuff. even had a rare sturmey-archer 2 gear fixed gear hub, but sold it for 500$. as for the differences between huret and simplex, due to the fact that both shifters pictured are almost identical, we can all agree that they were either manufactured by the same company or someone mislabled them. i don't think we can be 100% sure either way.

http://www.bikeville.com/derailleur.html