Natural evaporation humidifier, humidifying element of the...

Needle adjustment means

Needle and seat valve assembly

Needle valve carburetor

Non uniform water distribution system for an evaporative cooler

Non-circulating water system for evaporative coolers

Non-corrosive, non-staining evaporative cooler

Non-leaking venturi carburetor

Non-venting microgravity carbonator and method

Nozzle assembly for the water distribution tray of a pad-type hu

Odor control device

On-board fuel refining in motorized vehicles

Orifice device for air flow restriction

Outlet silencer for cooling tower, evaporator cooler or...

Overflow device for carburetor

Oxygen impregnation method

Oxygen supply humidification system

Oxygenation impregnation apparatus

Oxygenator

Ozonic bubble water generator