heading joint ; joint on square
直角目镜接合器 right angle eyepiece adapter
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结果证明，金属倒刺螺母螺杆连接件接口的接合性能优于直角榫接合和木螺钉接合的性能。
The results prove these properties of converse-spine nut to be better than those of dowel joint and tenon joint.
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