Psi Company

Professional Service Industries

Business-to-business services in Columbus, OH
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Established in 1881, Professional Service Industries Inc. is one of the leading engineering, consulting and testing firms in the United States.

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Frequently asked questions

Q:
Why is Intertek introducing the ETL Mark into the Building Products Market?
A:
The ETL Mark is Intertek’s most prominent certification in North America and it continues to gain momentum in the market place. It is a highly recognized and accepted mark...
A:
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