| 摘要 |
IN A DEVICE FOR THE VERIFICATION OF STRAIGHT LINES, PERPENDICULAR LINES, THIRTY DEGREE ANGLES, FORTY-FIVE DEGREE ANGLES, SIXTY DEGREE ANGLES AND NINTY DEGREE ANGLES A MECHANICAL APPARATUS MUST BE EMPLOYED. IN THIS INVENTION VERIFICATION OF STRAIGHT LINES, PERPENDICULAR LINES, THIRTY DEGREE ANGLES, FORTY-FIVE DEGREE ANGLES, SIXTY DEGREE ANGLES AND NINTY DEGREE ANGLES IS ACHIEVED BY VIEWING THE MATERIAL TO BE VERIFIED THROUGH THE INVENTION. THE INVENTION HAS A RAISED BASE FOR THE MATERIAL TO BE VERIFIED TO REST AGAINST THEREBY MAKING THE INVENTION SELF CONTAINED- THE VERIFICATION OF STRAIGHT LINES, PERPENDICULAR LINES, THIRTY DEGREE ANGLES, FORTY-FIVE DEGREE ANGLES, SIXTY DEGREE ANGLES AND NINTY DEGREE ANGLES IS MOST COMMONLY USED IN THE PRINTING INDUSTRY, GRAPHICS ARTS INDUSTRY AND PUBLISHING INDUSTRY.
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