Double glazing Outside lapping and Ziehschleifmaschine Make WMW Naumburg SLZAZ type 800 Make 12/1961, Year of construction 1961 Technical data: large outer diameter of the lapping or grinding wheel 800 mm kl. Inner diameter of the lapping or grinding wheels gr 400 mm Distance between new Läppscheiben / grinding wheels 130 / 80 mm Speed of the upper disc 16, 32, 50, 100 rpm. Speed of the lower slice 17.6 - 115 rpm. Direction of rotation of the discs election.