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الشخص الذي يمكن الاتصال به Mr. David
Bao sha Rd 1-3# Nan Gang Huangpu District, Guangzhou, Guangdong
Worm series has an interesting characteristic that no other gears set has: the worm can easily turn the gears, but the gear can&#**9;t turn the worm. This is because the angle on the worm is so shallow that when the gears try to spin it, the friction between the gears and the worm holds the worm in place.
