1. 3M Company
2. Agilent Technologies Inc.
3. Airtest Technologies Inc.
4. Ambetronics Engineers Pvt.Ltd.
5. Det-Tronics by Carrier Global Corporation
6. Dr?gerwerk AG & Co. KGaA
7. Emerson Electric Co.
8. Gastronics Inc.
9. Global Detection Systems Corp.
10. Halma PLC
11. Honeywell International Inc.
12. International Gas Detectors Ltd.
13. MSA Safety Incorporated
14. Otis Instruments Inc.
15. Pem-Tech Inc.
16. Sensidyne by SCHAUENBURG International GmbH
17. Siemens AG
18. Tek Troniks Ltd.
19. Teledyne Gas & Flame Detection
20. United Electric Controls
21. Vimal Fire Controls
22. Yokogawa Electric Corporation