Original Patentschrift - F. Fehr in Basel , elektr. Thüröffner , 1899 !!!

Original Patentschrift - F. Fehr In Basel , Elektr. Thüröffner , 1899 !!! - Architecture
Original Patentschrift - F. Fehr In Basel , Elektr. Thüröffner , 1899 !!! - Architecture
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