| 摘要 |
A system of movable headings for bookkeeping includes a cardboard heading strip slidable into transparent plastic envelopes, and the envelopes which are glued to pages of record books. Headings need be written on the heading strip only once. The heading strip then can be moved to another book, or to the next sheet in the same book, for reuse. In a sheaf of pages, the envelope can be moved from a top page to the next page and the page area occupied by the envelope on the previous page removed. A paper cover envelope, open at one end, has carbon paper inside and an adhesive backing; the heading strip is inserted and the headings written on the outside of the envelope. The headings are transferred to the heading strip by the carbon. The paper envelope serves as a record and title of the headings.
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