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公开(公告)号：US3757104A
公开(公告)日：1973-09-04
申请号：US3757104D
申请日：1971-04-30
Applicant: PLESSEY CO LTD
Inventor： COOPER P
CPC classification number: B63B45/00 , B63B2201/08
Abstract: The two ends of a cylindrical glass tube are sealed by lid members which are drawn together by a short knurled screw-head passing through a central hole in the top lid and engaging threads in a roof portion of an internal screen-forming housing which, by a bottom flange, is secured to the bottom lid.
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