Mechanically Interlocked Maintained Push Button Devices 29 18 mm Small Pilot Lights Type 4/13, Class I, Division 2 29 Cluster Pilot Light Devices (Bulletin 800T Only) 30 1-, 2-, 3-, 4-way Toggle Switches (Bulletin 800T Only) 31 Selector Push Button Devices (Bulletin 800T Only) 33 Cylinder Lock Push Button Devices (Bulletin 800T only) 34