Patent ID: 6434844
Filing Date: 2002-08-20
Classification: B43L

Abstract:
A see-thru engineering instrument having first and second longitudinal side edges defining a length of said engineering instrument, and third and fourth end edges defining a width of said engineering instrument, the length and width, in combination, defining an overall area of said engineering instrument, said engineering instrument comprising markings defining at least one reference line extending at an angle of 45 degrees to one of the longitudinal side edges and intersecting both of the side edges away from the midpoint of the length of said engineering instrument, said markings defining at least first and second longitudinal reference lines, extending along the length of said engineering instrument, said longitudinal reference lines being disposed inwardly of said first and second side edges, said first reference line being comprised in a first set of reference lines defining a first segmentation pattern interrupting the respective line markings and thereby defining discrete measurable longitudinal distances, said second reference line being comprised in a second set of reference lines defining second discrete measurable longitudinal distances different from the first discrete measurable distances of the first line.