had been juggling
Past perfect progressiveconjugation ofjuggle.There are other translations for this conjugation.

juggle

Jürgen Daubert, for example, had been juggling with transistors since his youth, developing amplifiers with increasing efficiency and output, and finally, as a sideline during his student days, had developed a new kind of amplifier electronics.
Jürgen Daubert, por ejemplo, había trasteado con transistores desde su juventud, desarrolló amplificadores con una eficacia y salida cada vez mayores y, finalmente, como actividad suplementaria mientras estudiaba, desarrolló un nuevo tipo de electrónica para amplificadores.
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