Ollerenshaw John E.
Olney Robert S.
Ondrus Mark
Ono Keitaro
Ono Tomohiro
Onsite Pro, Inc.
Onstenk David
Oppmann Arthur L.
Oppmann John F.
Optimus Water Technologies Ltd.
Orbit Irrigation Products
Ore William C.
Oribe Yoshinori
Orlev Scientific Computing Ltd.
Ortega Daniel A.
Ortel Thomas L.
Osburn William
Oskarsson Hans
Ostroot John W.
Ottenstein Sidney Allan