Centuries: 19th century - 20th century - 21st century
Decades: 1900s 1910s 1920s 1930s 1940s - 1950s - 1960s 1970s 1980s 1990s 2000s
Years: 1945 1946 1947 1948 1949 - 1950 - 1951 1952 1953 1954 1955
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Early exchanges used motors, shaft drives, rotating switches and relays.
Some types of automatic exchanges were Strowger, All Relay, X-Y, Panel and Crossbar.
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