30 June 2010
Richard Fisher provided the pdf's of drawing C7641866.
26 June 2010
David Aikens provided more information about the ISO standard.
18 June 2010
David Aikens (www.savvyoptics.com) kindly reviewed the entry and pointed out four problems. Mr. Aikens is not, of course, responsible for any remaining or newly-added errors.
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Last revised: 24 June 2010.