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专利名称：CODING INFORMATION申请号：AU5151673申请日：19730126公开号：AU4793B2公开日：19750904
摘要：A coded identification card which includes a core sheet and an outer adherentcovering for the core sheet. The core sheet has a given transmissivity to radiant energy ofa given frequency and intensity or a given range of frequencies and intensities whilepreselected coded regions of the core sheet have a transmissivity which differs from thatof the remainder of the core sheet. The outer adherent covering for the core sheet has ahigher transmissivity to the radiant energy than the lowest transmissivity portion of thecore sheet. The outer adherent covering preferably has a transmissivity which obscuresthe preselected coded regions from view by the naked eye.
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