SWITCHBOARD CBS N934

Table mounted, cordless, wooden switchboard.

Supplied in 1+3, 2+4 and 3+9 models.

Used on CBS exchange lines.

All the key handles are grey in colour except for the operator keys which are red in colour.

The 3+9 was also available as a 3+7 until 1947 when it was withdrawn.  The 3+7 is shown below.

The CB935 Mark 4 (1+3) was made by Ericsson, their model N105 (diagram N14964, dated 1932).

Drawings
63486 - 2+4 (Mark 1 & 2)
63487 - 3+9 (Mark 1)
63491 - 1+3 (Mark 2)

Wiring diagrams
LD 84 - 1+3
LD 85 - 2+4 & 3+9 (Mark 1)
LD 86 - 3+9
N934 - All models

CBS N934 3+7 (9)

Last revised: May 15, 2026