EditorialPalestinian students learn the Arithmetic skill using the International Mental Arethmetic "IMA Smart", Gaza city, Gaza Strip, Palestinian Territory - 07 Feb 2022
EditorialKnown as stalkerware, these apps record your conversations, location and everything you type, all while camouflaged as a calculator app. (Glenn Harvey/The New York Times)
EditorialComptometer, Felt and Tarrant Mfg. Co., Metal, plastic, USA, ca. 1887, appliances & tools, Decorative Arts, Calculator and cover, Calculator and cover.
EditorialPortrait of Nicolaus Petri Title page for: N. Petri. Practicqve, to learn to count, cypheer and keep a record, 1605, Portrait of Nicolaus Petri [van Deventer], calculator and astronomer in Amsterdam. Half-length portrait, behind a table with mathematic...
EditorialOrton & Sadler's Business calculator and accountant's assistant. A cyclopdia of the most concise and practical methods of business calculations, including many valuable labor-saving tables .. : Orton, Hoy D.
EditorialAdam Riese, Portrait of Adam Riese, the only contemporary figure of the calculator, title page, Riese, Adam (del.), 1550, Adam Ries: Rechnung auff der Linien und Federn, auff allerley hantierung gemacht durch Adam Risen. [Wittenberg]: [Georg Rhau], 1558.
EditorialTHE AMERICAN CENTENNIAL EXHIBITION, 1876: OUTSIDE THE EXHIBITION: THE "LIGHTNING CALCULATOR", US, U.S., USA, U.S.A., UNITED STATES, UNITED STATES OF AMERICA, AMERICA.