Tenneco is primarily an automotive components OEM and after-market ride-control and emissions products manufacturer. The Illinois-headquartered company sells products under its main brand names Clevite Elastomers, Monroe, Walker and XNOx. Tenneco currently generates about 8.6 billion U.S. dollars in net sales, employing over 30,000 people worldwide. Clean air products and systems currently comprise the company's most important segment, generating about 6.5 billion U.S. dollars in revenue in the 2017 fiscal year.

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