A Key to the Modern Sliding-Rule - Containing the Description and Exlpanation [!] of the Various Purposes, of That Valuable Instrument, As Now Used by His Majesty's Officers of Customs, Excise, &C. and Also of Two Improved Sliding-Rules, for Speedily and A (Paperback)

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A Key to the Modern Sliding-Rule - Containing the Description and Exlpanation [!] of the Various Purposes, of That Valuable Instrument, As Now Used by His Majesty's Officers of Customs, Excise, &C. and Also of Two Improved Sliding-Rules, for Speedily and A (Paperback)

R669

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