PDF: Ericsson 1913 switchboards catalog (abridged)
Ericsson 1913 switchboards catalog (abridged)
1913
PDF: Ericsson 1913 switchboards catalog
Ericsson 1913 switchboards catalog
1913
PDF: Stromberg 1914 Switchboards catalog
Stromberg 1914 Switchboards catalog
1914
PDF: Kellogg 1915 Switchboards catalog
Kellogg 1915 Switchboards catalog
1915
PDF: Kellogg 1915 Switchboards catalog
Kellogg 1915 Switchboards catalog
1915
PDF: Kellogg 1916 PBX Switchboards catalog
Kellogg 1916 PBX Switchboards catalog
1916
PDF: Stromberg 1921 High Efficiency Switchboard catalog
Stromberg 1921 High Efficiency Switchboard catalog
1921
PDF: Kellogg 1928 PBX Switchboards catalog
Kellogg 1928 PBX Switchboards catalog
1928
PDF: Ericsson 1937 switchboard catalog
Ericsson 1937 switchboard catalog
1937
PDF: Kellogg 1954 Toll Switchboard catalog
Kellogg 1954 Toll Switchboard catalog
1954