Original Patentschrift - F. Villinger in Freiburg i. Breisgau , Läute- Klingelstation Apparat !!!

Original Patentschrift - F. Villinger In Freiburg I. Breisgau , Läute- Klingelstation Apparat !!! - Telephony
Original Patentschrift - F. Villinger In Freiburg I. Breisgau , Läute- Klingelstation Apparat !!! - Telephony
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