| 摘要 |
The invention relates to a letter scale that can be set up by folding. The object of the invention is to provide a practical and accurate means of determining the appropriate postage rate for letters quickly and simply. The letter scale can be produced in a completely flat shape. The letter scale works like a see-saw. The letter is placed in one of the slots designated for that purpose in an upright position. If the letter scale topples, the weight of the letter exceeds the weight indicated on the relevant slot. |
