| 摘要 |
<p>Advertising billboard (10) and various methods of its construction utilizing the basic concept of drawing a sheet of fabric (42) having the advertising message on the front across the rigid billboard panel (18) and then introducing a continuous stream of air or maintaining a continuous pressure between the panel (18) face and the fabric (42) to smooth the fabric (42) into a continuous, slightly curved surface without wrinkles or sag lines.</p> |
