Try looking at Momart's work - they seem to lead the field (certainly
in Europe anyway) in moving
things around, I think they concentrate on art, but their standards
are very high. I don't know if they have a web page.
The company was started by Jim Moyes & he may have written stuff, he
certainly gives talks about the subject.
JaneMs F.J. Sarre
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Dept. of Museum Studies, University of Leicester,
103-5 Princess Rd East, Leicester