Air Pollution Technology, Inc.
Air Products and Chemials, Inc.
Air Purification Products International, Inc.
Air Quality Laboratories
Air Resources, Inc.
AirSep Corporation
Akademija Nauk SSSR
Aker Engineering a.s.
Akiyama Synith
Aktiebolaget Lectrostatic
Albanese Vincent M.
Albers Johannes H. M.
Albertsson Peter
Albiol Ignacio B.
Aldridge Frederick T.
Alexander Jeffrey C.
Ali-Khan Imran
Alig Franz
Allan Peter
Allen Ryne C.