发明名称 Mathematics notebook
摘要 A mathematics notebook having specially designed pages each having top and bottom horizontal edges, left and right vertical edges, and top and left side margins. A plurality of vertical lines are positioned on the page to guide the user in placing columns of numbers in vertical alignment to prevent error because of vertical misalignment. A number of pages may be spirally bound together along the page top edges. The vertical lines are positioned each equidistant from adjacent vertical lines, and the pages are spirally bound together along their top horizontal edges. A perforation line is provided near the upper page edge just below the binding material to permit each page to be neatly and smoothly removed from a quantity of additional pages.
申请公布号 US2007029777(A1) 申请公布日期 2007.02.08
申请号 US20050177961 申请日期 2005.07.11
申请人 WILLIAMS PATRICIA M 发明人 WILLIAMS PATRICIA M.
分类号 B42D1/00 主分类号 B42D1/00
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