
System X circuit board from digital switching subsystem, 1980
1980
1980
1846
1814
1914-1918
2014
1855
1903-1920
1855
1862
1920-1960
N. K.
1918
1918
1918
1918
1765-1780
1840-1900
1848
1920-1960
1936
1940
1943-01-01
1943-01-01
1954-10-21
1943-01-01
1961-10-04
1965-11-18
26-1-1944
26-2-1944
1930-1955
1896
1801-1900
1801-1900
1918
2017-2018
1880-1920
1930-1936
1920-1930
1781
1998
1959
1740-1800
1925-1960
1751-1800
1880-1920
1880-1920
1880-1920
1880-1920