Thanks to ISHUSH for spotting a link to a story about an odour generator developed by the Tokyo Institute of Technology.
See my earlier posts about simulated odours. I cant find any details on the TIT website, but this seems to work in the same way as the ill-fated ISmell: spray out different combinations of essential oils. TIT uses 96, the ISmell had 100-200.
Where these attempts seem to founder is that, despite or because of binding problem issues, we dont seem to regard smell as important when it comes to making realistic simulations.
After all, if you could transmit one smell by telephone right now to a friend, what would you send?