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公开(公告)号：US3472272A
公开(公告)日：1969-10-14
申请号：US3472272D
申请日：1966-11-21
Applicant: ERIE TECHNOLOGICAL PROD INC
Inventor： BERTICS JOHN P , ROYALL ROBERT L JR
CPC classification number: E04G21/3223 , E04F11/18 , E04F2011/1878 , E04H17/00 , F16L1/00 , F16L3/00 , F16L9/003 , Y10T137/6966
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