Hydra-Tech Hydraulics Inc.
Hydranautics
Hydraulic Specialty Company
Hydro International Plc
Hydro Pacific Technologies Inc.
Hydro-Dyne Engineering Inc.
Hydro-Tek Inc.
Hydrocyclonics Corp.
Hydrocyclonics Corporation
Hydroflow Inc.
Hydrograv Gmbh
Hydrologic Industries Inc.
Hydromation Engineering Company
Hydronautics Incorporated
Hydrotech Nils-Ake Persson Ab
Hydrotech Nils-Ake Persson Aktiebolag
Hydrotech Veolia Water Systems Aktiebolag
Hydrotechnic Corporation
Hydrotechnik Gmbh
Hydrotechnology Inc.