Telephone crossbar switch RVD 211, 1970
1970
1970
1969
1969
1970
circa 1969
1969
(1962); 1982
2000-100 BCE
1970
1969
1969
1903 (original); 1982 (model)
1990-96
1969
1969-1970
1970
1969
1970
4000-2001 BCE
About 1970
1970
1969
1970
1969
1969
1969
1969
1970
1970 and post 1989
1970
circa 1970
1970
1970-1900
10000-5000 BCE
1970
circa 1970
circa 1970
1970
circa 1970
1969
1970
1970
1969
1969
1969
1969
circa 1970
circa 1970
1969
1969