had been calculating
-había estado calculando
Past perfect progressive conjugation of calculate. There are other translations for this conjugation.

calculate

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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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