Just to move on a little, I'm trying to do some research into the history of the camera shutter. It would be most helpful if anyone could forward me patent number information from any older camera shutters they have, or suggestions as to particularly noteworthy or unusual shutter designs which they have come across, which I could try and investigate further. All help will be very much appreciated, and of course acknowledged if anything comes of the project. All the best Larry Cuffe -- Laurence Cuffe UCD Ireland ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.