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Brochure/Pamphlet. Condición: Very Good Indeed. C. Lovat Fraser Ilustrador. A very scarce brochure advertising a new model of the Comptometer, the first commercially successful key-driven calculator. This very scarce brochure outlines the principles and benefits of the Comptometer, a pioneering key-driven mechanical calculator patented by American inventor Dorr Felt.Including testimonials from various businesses and other users of the Comptometer.With charming coloured illustrations by British artist and designer C. Lovat Fraser.In the publisher's original illustrated wraps.Undated, dated from a copy held at the Victoria and Albert Museum. In the original illustrated wraps. Externally, with a few spots to the wrap, however still bright and pleasing, with minimal signs of edge wear. Internally, firmly bound. Pages are bright, with occasional spots. Very Good Indeed. book.