26th Apr, 2018 12:00
Fine Photographica & Instruments of Science & Medicine
A Madas Calculator
by H.W. Egli S.A. Zurich with black painted brass cover plate, with black painted steel lid, nickel plated bell and knobs, stamped Made in 'Switzerland, U.S. Patent Dec 16th 1913'; Note: the Madas is a Thomas de Colmar type arithmometer with the addition of an automatic division mechanism.
by H.W. Egli S.A. Zurich with black painted brass cover plate, with black painted steel lid, nickel plated bell and knobs, stamped Made in 'Switzerland, U.S. Patent Dec 16th 1913'; Note: the Madas is a Thomas de Colmar type arithmometer with the addition of an automatic division mechanism.
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Auction: Fine Photographica & Instruments of Science & Medicine, 26th Apr, 2018
