Paul's  L.M. Ericsson
1910-20 Models AF 210 & AF 211

2-line 3-way walnut wall extension switches
Switches have Brass and Nickel trim on polished walnut
Extension switches for 2 earth or metallic line circuits Local Battery Systems
These extension switches are for use with ordinary telephones, type AB or AC

AF211 added automatic reset capability & electrical release via inductor circuit

AF210 had mechanical release via ringer & required  a manual reset

AF211 mechanism for release and reset -  ringer circuit caused wheel to drop shutter

lightning arrestor design

Type AF 210 & AF 211 (Old Cat. No. 450) Backboard polished walnut. 3-way switch with drop indicator Ringer 1000 ohms resistance. Height of Backboard: 350 mm. Width of Backboard: 140 mm. Weight: 1,8 kg.