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公开(公告)号：US3539858A
公开(公告)日：1970-11-10
申请号：US3539858D
申请日：1968-01-30
Applicant: MACHLETT LAB INC
Inventor： RANDMER JACOB A , AGULE GEORGE J SR
IPC: H01J1/18
CPC classification number: H01J1/18
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