"Règles à calcul." . . . . "Reglas de calculo." . . "Teoria Da Computacao." . . "Slide-rule." . . "Slide-rule" . "Rechenschieber." . . . . "The Theory and Operation of the Slide Rule"@en . . . . . . . . . . "Einführung" . . . . . . . . . . "The theory and operation of the slide rule" . "The theory and operation of the slide rule"@en .