Siemens Switch
These are Siemens switch used in the automatic phone systems. Left one is rotating pre-selector and right one is elevation rotating selector.
With the right one you can select one line to 100 sub-lines.
These can be found all ready from the telephone handbooks from 1929.
With the right one you can select one line to 100 sub-lines.
These can be found all ready from the telephone handbooks from 1929.
