If there is no struggle, there is no progress. Those who profess to favor freedom, and yet depreciate agitation, are men who want crops without plowing up the ground. They want rain without thunder and lightning - Frederick Douglass, Abolitionist
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精密無間隙雙導程蝸輪蝸杆,蝸輪蝸杆減速機,平面二次包絡減速機,蝸輪絲杆升降機