PDF: Ericsson 1913 switchboards catalog (abridged)
Ericsson 1913 switchboards catalog (abridged)
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L.M. Ericsson
1913
PDF: Ericsson 1913 switchboards catalog (great illustrations at end)
Ericsson 1913 switchboards catalog (great illustrations at end)
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L.M. Ericsson
1913
PDF: 1914 Local Battery Switchboards
1914 Local Battery Switchboards
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Stromberg-Carlson
1914
PDF: Magneto Switchboards Bul. 10
Magneto Switchboards Bul. 10
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Kellogg Switchboard and Supply
1915
PDF: Switchboards Bulletin 11
Switchboards Bulletin 11
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Kellogg Switchboard and Supply Switching
1915
PDF: PBX Switchboards
PBX Switchboards
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Kellogg Switchboard and Supply
1916
PDF: 1921 High Efficiency Switchboards
1921 High Efficiency Switchboards
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Stromberg-Carlson
1921
PDF: Bltn 8X PBX Switchboards
Bltn 8X PBX Switchboards
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Kellogg Switchboard and Supply
1928
PDF: Ericsson 1937 switchboard catalog
Ericsson 1937 switchboard catalog
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L.M. Ericsson
1937
PDF: No. 3 Toll Switchboard Bul. 5410
No. 3 Toll Switchboard Bul. 5410
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Kellogg Switchboard and Supply Switching
1954