Secret coded card system

作者: Jr Irving B Cooper

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参考文章(6)
Boley A Andrews, Electrical coin selector ,(1947)
William R Clore, Article distribution system ,(1958)
Sauter William D, Norton Bernard J, Variable reluctance binary data transducer ,(1959)
George C Devol, Sensing device for magnetic record ,(1952)
Daulton Arthur Gerald, Laing Robert Heller, Batch weighing control unit ,(1962)