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| - No. 645,022, June 9, 1967, Pat. No. 3,487,568. [56] References Cited UNITED STATES PATENTS 3,545,459 12/1970 Phillips ..239/186 X Primary Examiner-Robert W. Michell Assistant Examiner-Richard Carter Attorney-Walter J. Jagmin [5 7] ABSTRACT Display apparatus for presenting data in visual form having panels provided with passages in which display elements, such as balls, are movably positioned and m
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