| 摘要 |
A lower plywood sheet and an upper plywood sheet which are set on a cylinder are cut in two processes by use of a router to create a 1.4-mm-wide groove in the back of the lower plywood sheet and in the front of the upper plywood sheet. Thus, a rotary cutting die which allows a 4-point (1.4-mm-thick) blade to be accurately inserted thereinto, a method for manufacturing the same, and a device for manufacturing the same are provided.
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