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Publication of GB523324ApublicationCriticalpatent/GB523324A/en
523,324. Calculating apparatus. RADEMAKER, W. E. Dec. 30, 1938, No. 37911. Convention date, Dec. 31, 1937. [Class 106 (i)] A tabulator computing appliance comprises a rotatable disc 14 carried by a frame member 4 with a guide part 8 for a slidable member 9. The disc 14 is divided into a plurality of sectors with data corresponding to a unitary price value 14b one set of which can be aligned with a tapered aperture 5 in the frame member 4. The slide 9 is formed with finger apertures 16 for adjustment purposes and with apertured ears 11 and a reading aperture 13. In the normal position of the slide the unitary piece is viewable through the tapered aperture 5.