Special Features:

Legend inscription reads mst arm, mst arm/master arm; major components: indicator housing 1, lens plate 1, 4 lamp light module 1, red lamp filter 1, yellow filter 1, green lamp filters 2+ switch actuator 1

Properties:

Two or more different types of items having a common mounting or mounted on each other which together forms a portion of a switch but which in itself is not a complete functioning item and cannot be assigned a more definite item name. See also switch section, rotary and contact assembly, electrical.