公开(公告)号：US4728294A

公开(公告)日：1988-03-01

申请号：US858450

申请日：1986-05-01

Applicant: George J. Bredehorn

Inventor： George J. Bredehorn

IPC: G09B3/04 ,  G09B3/00

CPC classification number: G09B3/04

Abstract: An educational device with which a user employs selected positioning of two masks over an array of normally unintelligible information to decipher an intelligible message therefrom, the positioning of the masks being determined by correctly associating useful information on a base member carrying the unintelligible information with markers and indicia carried on the masks and base member.

Abstract translation: 一种教育装置，用户使用通过一般的无法理解的信息的阵列选择两个掩模的定位来从其中解密可理解的消息的教育装置，通过将携带无法理解的信息的基础成员与有标记正确地关联有用信息来确定掩模的定位， 标记携带在面具和基座上。