about the entry on
scratch and dig

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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