| 摘要 |
A connection-type earth bar has a steel bar(1), whose middle part(3) is thinner than other parts. It is drawn by a copper tube(5) after spreading the conductive compound on the knurled surface of the steel bar so that the thickness of the copper at the middle par(3) is greater than at the other parts, thus reinforcing the connertion part. The inner cavity(8) is filled up with the squeezed conductive compound so it seals out water, protects against oxidization at the joint part between the steel and copper, and improves conductivity.
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