| 摘要 |
<p>The projection screen for slides or cine film is packaged for permanent protection with the packaging consisting of one or more board or plastics rolls. Both the projection screen and the packaging roll form a joint transport or storage unit which without damaging the package can be opened or closed at any time. The surface of the roll may be covered with a self-adhesive coloured foil or with a coat of paint. The projection screen may be made entirely without protection, as the board or plastics roll takes the place of the normal metal tube or box previously used for this purpose.</p> |
