Modern instruments and methods of calculation : a handbook of the Napier Tercentenary Exhibition (1914)
Horsburg, E. M. (Ellice Martin), Napier Tercentenary Exhibition (1914 : Edinburgh, Scotalnd) · London : G. Bell · leaf 383
:: POINTS OF :: TIM MACHINES Easy Movement. Quietness. Key-plate with total and partialclearing- device. Removable figure slide and key-plate. Electric Machines can be workedby hand if desired. Unitas Keyboard Electric Drive Machine. TIM & UNITAS Calculating Machines 10 Norfolk Street, Strand,… … TIM Single Slide Machine. THE PRESTOCALCULATOR For Discounts and Interests Englisli Patent 2j,jij—ipu.
