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Woolly, are you on Facebook. Somebody who operated the projector is in this group https://www.facebook....gid=7565301625&v=wall He may be able to help.
You could contact Professor Ian Ridpath, who had much to do with the London Planetarium, e.g....
http://www.ianridpath.com/zeiss.htm
His email address is '[email protected]'. He may well be able to tell you.
http://www.ianridpath.com/zeiss.htm
His email address is '[email protected]'. He may well be able to tell you.
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