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公开(公告)号：US3719804A
公开(公告)日：1973-03-06
申请号：US3719804D
申请日：1971-06-15
Applicant: INT COMPUTERS LTD
Inventor： ILLING D
IPC: G06K19/067 , G06K19/06
CPC classification number: G06K19/067
Abstract: A permanent information storage device has a hidden conductive pattern of first areas selectively connected to a second area. Reading is by energizing capacitive couplings to the first areas and detecting for response in the second area.
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