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Power source unit employing piezoelectric transformer a high power source unit employing a piezoelectric transformer detects whether the output of the piezoelectric transformer reaches a predetermined value or not.
Taper barrel, screw fastening structure using taper barrel with female screw, formed drill to machine taper barrel, and hammer for driving taper barrel
Dispositif et procede d'alimentation sous tension continue d'une chaine de traction au moyen de convertisseurs a partir de differentes tensions alternatives ou continues