Initially, nearly all blowers were the two-lobed type. Despite offering low noise, low vibration, and high efficiency, the three-lobed type was not produced because manufacturing it was difficult. Only Anlet Manufacturing rotors of high precision and also at low cost became possible through use of dedicated machining equipment for three-lobed blowers that only Anlet holds patents for, and Anlet succeeded in becoming the first in Japan to achieve volume production of the three-lobed type.