Patent
Patentdatenbank Tschechoslowakei
1918
1920
1921 1922 1923 1924 1925 1926 1927 1928 1929 1930
1931 1932 1933 1934 1935 1936 1937 1938 1939 1940
1941 1944 1946 1948 1949 1950
1951 1952 1953 1955 1956 1957 1958 1959 1960
1961 1962 1963 1964 1965 1966 1967 1968 1969 1970
1971 1972 1981