... high transmission efficiency, smooth operation, durable. 3, using the cylinder-type filters, for network cycle than ordinary nets for 7-8 ... networks. 4, the first use of center-mode feed-type spiral flow channel, head for the high-quality carbon steel ... 5, traction roller, roller coiling Balancing all of detection, correction, precision grinding. 6, on the use of short-chain rotational traction, not ...