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发明名称
TUBE AND METHOD OF FORMING SAME
摘要
<p>A polygonal tube is produced from metal strip by forming rows of recesses (15) and projections (16) along opposite edges of the strip and then bending the strip until each projection is received in a corresponding recess to form the tube.</p>
申请公布号
WO1993005903(A1)
申请公布日期
1993.04.01
申请号
GB1991001588
申请日期
1991.09.17
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发明人
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