A calculator by Léon Bollée, Le Mans, the flat oxidised brass bed with fourteen pairs of columns beneath a sliding carriage of six stacks of ten hinged indices, with addition and subtraction levers at each side --13½in. wide

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A calculator by Léon Bollée, Le Mans, the flat oxidised brass bed with fourteen pairs of columns beneath a sliding carriage of six stacks of ten hinged indices, with addition and subtraction levers at each side --13½in. wide

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Lot Essay

Léon Bollée is credited with the invention of direct method multiplication, 1887 (V. Turner, G.L'E, Nineteenth Century Scientific Instruments, p.285)

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