1937
1940
1941
1942
1946
1947
1949
1951
1953
1954
1955

1890s
1900s
1910s
1920s
1930s
1940s
1950s
1960s
1970s
1980s
1990s

Categories

Categories:

Telecommunications-related introductions by year
1947 introductions
Telecommunications-related introductions in the 1940s