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Matick, Pleshko, Sie and Terman1 have described the thick-film read only store (TFROS), a semipermanent storage device utilizing changeable cards containing permanent magnets as the storage medium. The purpose of these magnets is to provide a saturating field for the film bit locations in the TFROS. The intention of this Communication is to describe briefly the process used to obtain these magnets and the way they are utilized in the TFROS. The required magnetic properties are covered in Ref. 1 and will not be discussed in detail in this Communication.
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