Tang dynasty
The inventor Ding Huan (fl. 180 AD) of the Han dynasty invented a rotary fan for air conditioning, with seven wheels 3 m (10 ft) in diameter and manually powered. In 747, Emperor Xuanzong had a "Cool Hall" built in the imperial palace, which the "Tang Yulin" () describes as having water-powered fan wheels for air conditioning as well as rising jet streams of water from fountains. During the subsequent Song dynasty, written sources mentioned the air conditioning rotary fan as even more widely used.
Elie Aghnides
Aghnides' first major invention was the faucet aerator, which is a standard part of nearly all faucets today, in 1943. He said he got the idea from watching a waterfall. He also had a number of related patents throughout the years stemming from his original invention. This invention and its subsequent modifications and additions made him very wealthy. He kept luxury apartments in both New York City and Paris.