[1] Zhang Shan et al.. Laser cutter of slotted pipe. China Patent, Practical New-Type, ZL 96 2 05220. 5. 1997. 12. 3
[1] Zhang Shan et al.. Laser cutter of slotted pipe. China Patent, Practical New-Type, ZL 96 2 05220. 5. 1997. 12. 3
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