Sanitary apparatus and installations, namely, sink units, toilets, bidets, urinals being sanitary fixtures, bath tubs, shower pans being shower trays, taps being faucets, taps for washstands, toilet bowls, toilet seats, toilet cisterns, water flushing installations in the nature of flush levers, automatic flush valves and flush handles for toilets, lavatories, vanity units being hand wash basins being parts of sanitary installations, and vanity sink tops incorporating basins