Grinding cylindricalSpur gearE sebelisoang ho mochine oa ho chechisa ka har'a mechini ea oli
Likhoele tse ka holimo ho le China Chaena, E na le basebetsi ba 1200, ba fumane mesebetsi e 31 ea 31 le li-patents tse 9. Ho fana ka mocheso, lisebelisoa tsa tlhahlobo.