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file U (Stack)Layton, C. & E.
C. & E. Layton's Improved Arithmometer, formerly known as Tate's Arithmometer, or Tate's Improved Arithmometer
Sole Makers: C. & E. Layton, 56, Farringdon Street, London, E.C. Facsimile reprint of instruction pamphlet, n.p., n.d. [Rogers Turner, Greenwich, 1988; original c.1905]. Presented by A. J. Turner Esq.
[1988-163]
1988?