Abstract: A push button switch comprising a case, an operation section having operation plungers which can be pushed into the case and which can be separated from each other, and a switch section which is made operative and inoperative by the pushing of the operation section housed in the case, characterized by a first rubber seal for sealing between a lower plunger of the operation plungers and the case, and by a second rubber seal for sealing between the operation plungers.

Abstract: A barrier assembly includes an intermediate barrier member which is inserted from the front side of a mounting panel and a fixing barrier member which is inserted from the rear side of the panel and connected to the intermediate barrier member. After a plurality of small-sized controlling devices has been secured to the mounting panel, the intermediate barrier member is inserted into the area between each pair of adjacent controlling devices from the front side of the panel. Then, the fixing barrier member is inserted into this area from the rear side of the panel and connected to the intermediate barrier member. Thus, it is possible to prevent the intermediate barrier member from being pulled out forward of the panel and also from being withdrawn rearward of the panel by virture of the fitting engagement with the fixing barrier member. It is possible to remove the two barrier members toward the opposite directions, from which they are inserted when assembled, by disengaging them from each other.