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A data card wherein various data are recorded with a fluorescent material which emits infrared rays when excited by infrared rays is disclosed....
http://www.google.com/patents/US4202491?utm_source=gb-gplus-share
Patent US4202491 - Data card
Data card
Atsushi Suzuki
Overview
Abstract
Drawings
Description
Claims
Patent number
: 4202491
Filing date
: Sep 26, 1977
Issue date
: May 13, 1980
Plain text
PDF
