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Headquarters Address:   OATS Address:
1250 Peterson Dr.   166 South Carter
Wheeling, IL 60090   Genoa City, WI 53128
Phone: 847-537-6400   Phone: 262-279-0210
Fax: 847-537-6488   Fax: 262-279-3630

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Conformity Assessment Address:
(Wheeling East Campus)
200 Marquardt Dr.
Wheeling, IL 60090
Phone: 847-537-6400
Fax: 847-947-8651

*Please, no unsolicited faxes.

Email Contacts:

General: Brian Mattson
Sales: Jack Black

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