Original Patent - Gustav Bernhard Helling in Crimmitschau , 1880 , Rohrverschraubung !!!

Original Patent - Gustav Bernhard Helling In Crimmitschau , 1880 , Rohrverschraubung !!! - Crimmitschau
Original Patent - Gustav Bernhard Helling In Crimmitschau , 1880 , Rohrverschraubung !!! - Crimmitschau
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