| 摘要 |
<p>The letter form, produced as continuous stationery, has lines of holes along two edges for the drawing sprocket of the processing machine. It is divided into three panels by fold strips so that it can be folded for mailing, and also for return. The bottom panel has a vertical fold line so that it can be used as an envelope, and close to the horizontal line along which it is detached the middle panel has at least one or more sheets used for a reply. The sheets can be an original and a copy, with a carbon paper between. A sheet can carry a carbon paper coating on one side. Colouring materials can be incorporated.</p> |
