ETS-Lindgren, Inc.

1 P lac e and date: For the is s uing offic e: Katy, TX, 19 September 2018 DNV GL Business A ssurance 1400 Ravel lo Drive, K aty, TX, 77449-5164, USA David Hilbert M anagement Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV GL Business Assurance USA, Inc., 1400 Ravello Drive, Katy, TX 77449 USA. TEL:281-396-1000. C ertificate N o: C E RT-11548-2006-AQ-HOU-ANAB V alid: 1 9 September 2 018 - 1 9 September 2 021 This is to certify that the management system of ETS- lindgren , Inc. 1301 Arrow Point Drive, Cedar Park, TX, 78613, USA and the sites as mentioned in the appendix accompanying this certificate has been found to conform to the Quality Management System standard: ISO 9001:2015 This certificate is valid for the following scope: Design, Manufacturing, Calibration, Construction (Installation and Project Management) and Service of Acoustic and Radio Frequency (RF) Equipment and Facilities.

2 C ertificate N o: C ERT-11548-2006-AQ-HOU-ANAB P lac e and date: Katy, T X, 1 9 September 2 018 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV GL Business Assurance USA, Inc., 1400 Ravello Drive, Katy, TX 77449 USA. TEL:281-396-1000. Page 2 of 2 Appendix to Certificate ETS- lindgren , Inc. Locations included in the certification are as follows: Site Name Site Address Site Scope ETS- lindgren , Inc. HQ 1301 Arrow Point Drive, C edar Park, TX, 78613, USA Management, Sales, Quality, Engineering, C alibration, Testing, Services, Operations, Human Resources ETS- lindgren , Inc.

3 1016 Waldron Drive, Durant, OK, 74701, USA Manufacturing ETS- lindgren , Inc. 1360 North Wood Dale Road, Suite G, Wood Dale, IL, 60191, USA Design, Installation and Project Management ETS- lindgren , Inc. 7352 Giles Drive, Minocqua, WI, 54548, USA Design, Manufacturing and Project Management