A toilet tray and a toilet non-water flushing system having the toilet tray were developed in the United States.
U.S. invention patent US787782 for toilet non-water flushing device
A non-water flushing toilet toilet pan device
A range-measuring automatic foaming, deodorizing, disinfecting and water-saving toilet and its range-measuring method
A non-water flushing device for toilets with an infrared range measuring liquid level measuring instrument