JBT Series Juya Juya Daya-da-Kasa Mai Wanke kalaman wanki
Partially overlapped single-Layer kalaman spring, jimlar adadin yadudduka daya ne, da zobe ba a rufe, da iyakar an partially overlapped, da overlapping matsayi ne a ganiya ko trough daga cikin kalaman, da kuma yawan taguwar ruwa ya fi ko daidai da 3.