Patent ID: 7415772
Filing Date: 2008-08-26
Classification: G01B

Abstract:
1. A set of rulers for teaching students to read measurements, said set comprising: a) a first ruler having a first group of incremental division lines for a first group of measured lengths, each of said lines of said first group having a first length extending from a proximal end to a distal end and being of a first color; b) a second ruler having said first group of incremental division lines of said first length and said first color and a second group of incremental division lines for a second group of measured lengths, each of said lines of said second group having a second length and a second color, said second group of lines having a proximal end beginning at and extending from a distal end of said lines of said first group when said second group of measured lengths correspond to said first group of measured lengths; c) a third ruler having