US Patent 7647717 Numerical display device

A numerical display device includes a base panel, a plurality of numerical sections provided on the base panel to form a numerical character, a plurality of folding panels pivotally coupling at the base panel to fold between a first position and a second position to selectively change the numerical character, and a magnet arrangement for retaining each of the folding panels at the first and second positions, wherein at the first position, the folding panel is pivotally folded on the base panel to fully cover the respective numerical section, and at the second position, the folding panel is pivotally folded at 180° to expose the respective numerical section.