A combination lock and padlock combination for visually indicating a key opening permission being allowed or not by forming two opposite marks on a wheel is disclosed. In one embodiment, a data storage switch includes a master expander having a first firmware module operable to link a plurality of logical volumes to at least one initiator through a first plurality of physical transceivers. The second contact surface of the second member is disposed adjacent the first contact surface of the first member. If the light emitting semiconductor structure includes a nonconductive substrate, the light emitting semiconductor structure is coated with an electroconductive material to induce phosphor deposition. For this purpose, the mercury lamps, or the sheets of transparent plastics material covering these lamps, are doped or coated with one or more organic or inorganic fluorescent dyes that partially absorb the blue light emitted by the mercury lamps and convert it into light of wavelengths of 550 to 650 nm. The SONOE provides a non-linear optical interaction between the outputs such that a propagation direction modified laser beam is provided that propagates at a different angle than the incoming laser beam and at a difference wavelength thereof.