Otu n'ime isi ụkpụrụ na-akwalite mmepe ngwaahịa anyị bụ echiche nke symbiosis.Anyị kwenyere n'ịmepụta ngwaahịa na-abụghị naanị na-ebuga arụmọrụ pụrụ iche kamakwa na-enye aka na-edozi nsogbu mmekọrịta ọha na eze.N'iburu nke a n'uche, a na-emezi Cylinder Drum Brake Wheel ka ọ bụghị naanị irute ụkpụrụ ụlọ ọrụ kamakwa kwekọọ na ọrụ anyị n'iwulite ọha mmadụ ka mma.
Họrọ ụlọ ọrụ BGF maka ịdị mma, ntụkwasị obi na ntinye aka na ọha mmadụ ka mma.