Features: 1. According to mechanics of designate theory,main body adopted an arc structure to reduce a dead space of stress to avoid vibration and expand life cycle. 2. Except high strength of material,platform has adopted the pre-eliminated stress of heat treatment to maintain deformation. 3. The square shaft of tension device has used the tenacious material and pay attention to heat treatment will has more harder and wear-resisting. 4. When a saw b
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