American Gas Association (AGA)

Date Originally Recognized: June 7, 1990

Date Recognition Terminated: July 20, 1999

Reason for Termination: Voluntary Withdrawal (sites acquired by CSA)

Applied Research Laboratories of South Florida, LLC

(Formerly Applied Research Laboratories, Inc.)

Date Originally Recognized: November 21, 1997

Date Recognition Terminated: January 28, 2008 (see Federal Register notice)

Reason for Termination: Revocation

Date Recognized Reinstated: April 25, 2018

Date Recognition Terminated: July 31, 2023

Reason for Termination: Voluntary Withdrawal

Detroit Testing Lab (DTL)

Date Originally Recognized: Date Originally Recognized: April 27, 1998

Date Recognition Terminated: April 28, 2003

Reason for Termination: Voluntary Withdrawal

Entela, Inc. (ENT)

Date Originally Recognized: July 26, 1994

Date Recognition Terminated: January 28, 2008 (see Federal Register notice)

Reason for Termination: Voluntary Termination (acquired by parent company of another NRTL: ITSNA)

Electrical Reliability Services, Inc. (ERS) (formerly, Electro-Test, Inc. (ETI))

Date Originally Recognized: October 6, 1995

Date Recognition Terminated: June 23, 2008 (see Federal Register notice)

Reason for Termination: Denial of renewal

Wyle Laboratories, Inc. (WL)

Date Originally Recognized: July 22, 1994

Date Recognition Terminated: August 24, 2011 (see Federal Register notice published on September 8, 2011)

Reason for Termination: Revocation

National Technical Systems, Inc. (NTS)

Date Originally Recognized: December 10, 1998

Date Recognition Terminated: June 21, 2012 (see Federal Register notice published on May 24, 2012)

Reason for Termination: Expiration of Recognition