| 摘要 |
PURPOSE: A slipperiness preventing ruler with a support stand is provided to closely touch a ruler with a small amount of forces to a surface using a rubber material. CONSTITUTION: A slipperiness preventing ruler with a support stand forms an equilateral trapezoid groove on a general study ruler. The ruler inserts an equilateral trapezoid transparent rubber material into the equilateral trapezoid groove to increase a friction force of a ruler. The slipperiness preventing ruler fixes a support stand to the bottom of a ruler when using the ruler to make a line or measure a length.
|
