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1.发明授权Combination vacuum-pressure, particulate material conveying and blending system 失效组合真空压力，颗粒物料输送和混合系统
公开(公告)号：US3309148A
公开(公告)日：1967-03-14
申请号：US52997866
申请日：1966-02-25
Applicant: HALLIBURTON CO
Inventor： WILDER LEE N
IPC: B65G53/00
CPC classification number: B65G53/00 , B65G2812/1691
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