Патенты 1929: roll cut 1932: Utility knife sharpener 1937: Circular knife sharpener 1938: Utility circular blade grinder 1949: spindles 1950: adjustment (491153) 1950: adjustment (674557) 1955: drive (1055995) 1956: drive (15221) 1957: drive (1147496) 1960: drive (342864) 1963: Coolant water cleaning 1965: cutting duplicator: «Schneidenabziehapparat» 1969: Cooling water purification 1972: roll Grinders 1972: Quick Change Chuck 1974: sludge discharge 1991: Rotary table grinder 1996: MSA