| 摘要 |
A lock seam for joining a first edge of material to a second edge of material is described. The first edge is wrapped in a first curl such that the first curl is substantially circular in shape. The second edge is wrapped in a second curl which is also substantially circular in shape. The inside surface of the first curl is wrapped about the outer surface of the second curl. The lock seam formed by this manner is particularly advantageous for muffler assembly.
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