Open/Close Type Sign Board

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The device : advertising sheet having an objectionable ad content is recorded is provided at the inside thereof with a signboard base; and said signboard mounted in a base the cover at said front of the advertising sheet having an by magnetic force said signboard is pivotally attached to the base at the front side which is the forward cover a closable truss girder of deck panel for a disclosure. Said signboard base, the lower mounted whole cover of said said front cover and said base frame for attaching the brake actuator assembly to said base frame is provided, which includes a magnetic element; said base frame for non-volatile mounting of the magnetic element includes receiving groove for receiving; said magnetic spaces, said base frame an end of the optical fiber extends up to 210, 220 in shape with use in extrusion molding. According in the device, base frame extrusion form pushbuttons magnetic receiving groove simultaneous forming magnetic current so as for forming receiving groove does not need method for manufacturing a rare-earth can be hole is formed, is sintered.