| 摘要 |
Improvements in devices for measuring, laying out and ruling keyline boards for printed materials; a device for pre-ruling artists' and printing boards including a baseboard adapted to receive a keyline board thereon having precisely positioned location pins surrounding the work area and a slotted ruler for use with the baseboard, such producing page size and crop mark lines, bleeds, automatic register mark rules and all horizontal and vertical ruling required for 11 by 17 inch, 81/2 by 11 inch and 51/2 by 81/2 inch formats.
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