Original Patentschrift - Photometer , Photographie , 1899 , D. Hoffsümmer in Berlin !!!

Original Patentschrift - Photometer , Photographie , 1899 , D. Hoffsümmer In Berlin !!! - Supplies And Equipment
Original Patentschrift - Photometer , Photographie , 1899 , D. Hoffsümmer In Berlin !!! - Supplies And Equipment
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