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西文图书1.World Patents Index Gazette. section P, general Z89/W927
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西文图书2.World patents index gazette. Section P, General 71.27071/W927(G)
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西文图书3.World Patents Index Gazette. section P, Weekly 71.27071/W927(W)
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西文图书4.World patents index gazette. Section Q, Mechanical 71.27071/W927(M)
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西文图书5.World Patents Index Gazette. section R, electrical 71.27071/W927(E)
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西文图书6.World Patents Index Gazette. section Ch, chemical 71.27071/W927(C)
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