Support structures

A mimic board, comprising a lattice work support structure having a regular array of rectangular apertures for receiving mimic tiles, said structure comprising:

• a plurality of like elongate strip members of metallic material arranged in two sets of parallel members, the one set being at right angles to the other set, each member including an array of regularly longitudinally spaced apertures interspaced with waists therebetween, in which the longitudinal dimension of each aperture is greater than the height of the strip members and the lateral dimension of each aperture is smaller than the height of the strip member but greater than the minimum dimension of each waist such that each member of one set, when its minor axis is at least substantially parallel to the major axes of the members of the other set can slide through the apertures of the other set, and can be rotated when its waists are located opposite a respective aperture of the members of the other set, to form the structure;
• each said waist comprising two centrally-located, squared-U shaped notches formed directly opposite one another in opposite edges of the respective elongate strip member, each such notch being flanked on both shoulders thereof by respective chamfers of substantial extent which cooperate to form a tapered guide into the respective said notch;
• and
• a respective mimic tile secured in each of at least several of said apertures, at least some of said mimic tiles each comprising:
• a face plate bearing a forwardly-presented surface which is constructed and arranged to display information and to substantially fully cover a respective said aperture;
• and
• rearwardly projecting resilient leg means secured to the face plate and constructed and arranged to engage at least two opposed elongate strip members from within a respective said aperture for removably securing the respective said face plate as a covering for said aperture.