Electronic transmitters and receivers for optical and electric data transmission between components movable against each other; [ torque meters; solenoid valves as electromagnetic switches; pressure indicator plugs for valves; scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signaling, checking, life-saving and teaching apparatus and instruments, namely, cameras, underwater housings for cameras; apparatus and instruments for conducting, switching, ...

capless closures in the nature of selectively lockable and unlockable valves for the filler pipes of vehicular gasoline tanks