Ericsson 1913 switchboards and accessories catalog (abridged)
Ericsson 1913 switchboards catalog (with great illustrations at end)
1914 Local Battery Switchboards
Magneto Switchboards Bul. 10
1921 High Efficiency Switchboards
Ericsson 1937 switchboard catalog
No. 3 Toll Switchboard Bul. 5410
