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Mechanical calculator

EDMONSON'S PATENT W.F. STANLEY GREAT TURNSTILE HOLBORN LONDON. W.C (engraved on the maker's trade plate. ENGINEERING DEPT. GLASGOW UNIVERSITY (Engraved on the centre plate). DES EDMONSON,Joseph,M.B. 1883 Halifax, England MANU W.F. Stanley. circa 1900 South Norwood, London, England This Edmonson's circular stepped cylinder, four rules calculator with 8 digit slide input register, no revolutions reg…