Ericsson poolwisselaar. / Ericsson "poleswitch".

Ericsson poolwisselaar. Catalogus 132, p 198, type RH 20000-20100.

Ericsson "poleswitch". Catalog 132, p 198, type RH 20000-20100.

 

Pole switch closed
Pole switch open
 Pole switch open