Abstract: A method of presenting an optical code on a display is described. The method comprises: presenting the optical code in a first format at a first time period so that the optical code can be captured and decoded by a mobile device, such as a smart phone. The method also comprises presenting the optical code in a second format at a second time period. The second format is visually different to the first format to a human but when captured and decoded by a mobile device, the second format produces the same decoded results as the first format.

Abstract: A method of presenting an optical code on a display is described. The method comprises: presenting the optical code in a first format at a first time period so that the optical code can be captured and decoded by a mobile device, such as a smart phone. The method also comprises presenting the optical code in a second format at a second time period. The second format is visually different to the first format to a human but when captured and decoded by a mobile device, the second format produces the same decoded results as the first format.

Abstract: A novel bracket and hanger assembly which is designed for attachment to the sidewalls of an elongate support which is rectangular in cross-section is disclosed. The bracket is either an L-shaped member having two limb sections or an U-shaped member having three limb sections. Each of the limb sections has an aperture extending therethrough and an interior face engageable with one of the sidewalls of the elongate support. The hanger has an elongate hook and an enlarged end portion. The hook is passed through an aperture from the interior face of the limb section until the enlarged end portion abuts a surface area surrounding the aperture. The assembly is further characterized by means for maintaining the hanger in a selected rotational position relative to a limb section through which it extends when the enlarged end portion of the hanger abuts the surface area surrounding the aperture.

Abstract: A novel modular metal fence or gate panel assembly constructed from vertically spaced apart rails and a horizontal row of vertically disposed pickets is disclosed. At least the upper rail is locked to the pickets which extend therethrough by means of an elongate locking bar which is slidingly disposed within the rail. The bar is moveable from a first position wherein apertures provided in the bar are in full open alignment with picket receiving apertures located in the rail, to a second position in which inwardly projecting flanges in each of the bar apertures are respectively received in rail connecting recesses located in the sidewalls of the pickets.