Particle Monitoring System (U.K.)
Honeywell (U.S.A.)
TUNNEL SENSORS (U.K.)
FOSSIL POWER SYSTEMS (Canada)
SETRA (U.S.A.)
Orange Research (U.S.A.)
Entegris (U.S.A)
Nu Pure (Canada)
Matheson (U.S.A) / Taiyo Nippon Sanso (Japan)