LOT 15
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2 Disc Adders and 1 Set of Calculating Rules
作品估价：EUR 280
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成交状态：未知
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25%
图录号：
15
拍品名称：
2 Disc Adders and 1 Set of Calculating Rules
拍品描述：
1) "Le Belotor", c. 1920, France, addition only, 3 digits, tens transfer, nickel-plated cover plate, with pin in holder, 6 x 3 1/3 x 1/5 in., very rare. – 2) The BriCal, c. 1908, for additions in British currency (pounds, shillings, pence), in original box, serial no. A616, Ø 5 ¼ in. – And: 3) "Table simplificative Multiplication et Division", Paris 1890, by Joseph Blater, table for simplifying multiplication and division, 28 multiplication rules in cardboard slipcase.
condition: (2–3/2–3)
condition: (2–3/2–3)