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公开(公告)号：US3394286A
公开(公告)日：1968-07-23
申请号：US45940765
申请日：1965-05-27
Applicant: NAT RES CORP
Inventor： BROCK FRANK J
IPC: H01J41/04
CPC classification number: H01J41/04
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公开(公告)号：US3395565A
公开(公告)日：1968-08-06
申请号：US53365966
申请日：1966-03-11
Applicant: NAT RES CORP
Inventor： BROCK FRANK J , FRANK FEAKES
CPC classification number: H01J41/04 , G01L27/005
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