History > Historical patents


10.03.1926 German State Patent Office Serving as a helical coil spring backup	04.11.1927 Empire Train Central Office Free license for high-voltage lock washers	01.02.1929 Swiss Confederation Screw locking with two oppositely running threaded nuts having

09.02.1929 Italy State Patent Office	27.12.1929 Austrian State Patent Office	04.02.1930 German State Patent Office Coil spring

13.03.1930 Poland State Patent Office	09.02.1934 German State Patent Office Mounting rails on rib washers	02.10.1935 German State Patent Office Table clamps with suspension hook