minable e seam 可采煤层

Side e seam 侧缝

E Seam and Attachment Strength 缝线及附件强度

guide e seam 标准层

groove e seam 折缝咬口接合

inside e seam 下裆缝

unworkable e seam 不可采煤层

undersleeve e seam 袖底缝

double e seam welder 双层缝焊机