장착형태 = Panel Mount Illuminated versions require a T1 bi-pin filament lamp or LED, see typically stock no's ; 6559491 6559491. 9 mm Round ; Square Illuminated Switches. The pushbuttons are fitted with snap-action or low-level switching systems Mounting from the front through the mounting hole is assured even when the wiring has already been attached The units are equipped with soldering/plug-in terminals