| 摘要 |
Patent protection is afforded to the system of the square-cutting knife with and without shapers formed in a square and provided by round knives fitted on both sides of a hollow spindle and having a connected transverse knife and by various shaped part-round and/or transverse knives fitted in this square. The square-cutting knife with and without shapers is independent of pattern inserts of any type formed in a square and is also independent of materials, sizes and dimensions used.
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