描述

Classification:

Button board (bottom)

Button Board (Top Layer)

Button board (middle layer)

Outbound call set (bottom)

Outbound call set (top floor)

Outbound call set (middle layer)

Outbound call with lock (bottom)

Outbound call with lock (top layer)

Outbound call with lock (middle layer)

Arrival bell (bottom floor)

Arrival bell (top floor)

Arrival bell (middle level)