A folding mesh chair includes a seat and a backrest carried between opposite frame sides. When a non-standard signal is input as an input video signal, coefficients of interpolating filters for carrying out interpolation on pixels of timely-sequential field video signals are fixed as a non-standard signal supporting signal processing. The polishing pad is characterized by: a pressure sensitive adhesive formed on the reverse surface of the substrate and used to couple with a bottom layer, and the horizontal adhesion of the pressure sensitive adhesive is higher than the vertical adhesion of the pressure sensitive adhesive. The sleeve, which is easier to manipulate than the wire, is then spot welded to the electrode. Bolted connection, comprising the bushing and a bolt provided with a head and inserted through the bushing, whereby the length of the bushing exceeds the length of a hole formed for the bolted connection in a metal bar. For each of the plurality of projection images, an enhanced projection image can be generated.