There are several jobs that work with industrial coating.
Contracting jobs and Painting jobs can use industrial coating.
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DuPont Industrial Coatings.
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The company MEDOVENT GmbH provides chitosan coating for medical
and industrial applications.
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Coating a diamond implies that the diamond materials in question
are to be put to an industrial use, not a gem-stone use.
You can read more about one purpose of coating a diamond,
below.
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I suggest Premier Industrial Coatings in Atlanta, GA. They are
located on the north side of the city on Mount Paran Rd. Give them
a call at (404) 843-9805.