Hydraulic Engineering S.A. Luxembourg
Hydro Service & Supplies, Inc.
Hydro Systems International
Hydrokinetic design, Inc.
Hydrological Services Pty. Ltd.
Hydronic Systems, Inc.
Hydrotech, Inc.
Hyo Nishigawa
Hyodo Tomonobu
Hyon Chin-Soo
Hytry Renee M.