JBL, JBT, JB-TL Specific forms parallel groove clamp is suitable for unendure force splicing and branch on the aerial wire , being used with insulation cover . It's action is insulation protection.
TL系列异型并沟线夹适用于架空电力线路中导线的非承受力接续与分支，与绝缘罩配套使用起防护绝缘作用。
A closer inspection of the tool mark shows a series of parallel teeth marks, probably from the use of a plumber's wrench or tongue-and-groove pliers.
放大后的检验，可见一系列平行的齿纹，有可能来自管钳，会其他靠钳齿来抓牢工件并旋转的钳子。
Idler roller can be divided into groove, parallel to the roller, spherical roller, buffer roller, roller screw, corrosion-resistant roller, vertical roller block;
托辊可分为槽形托辊、平行托辊、调心托辊、缓冲托辊、螺旋托辊、耐腐蚀托辊、立挡辊等；
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