had been calculating
-había estado calculando
Past perfect progressiveconjugation ofcalculate.There are other translations for this conjugation.

calculate

Such an engine would easily have been able to compute all the tables that de Prony had been calculating, and it was intended to have a printer to print out the results automatically.
Ese motor que fácilmente han sido capaces de calcular todos los cuadros que habían sido de Prony cálculo, y se tenía la intención de tener una impresora para imprimir los resultados automáticamente.
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