| http://www.w3.org/ns/prov#value | - No. 150,311 8 Claims. (Cl. 33-174) This invention relates to a novel educational and useful printing ruler and more specifically to a printing ruler comprising an elongated panel of a transparent material which has a plurality of indicia forming openings formed therein which may be utilized to guide a scribing device, pen or pencil or other marking tools in the forming of indicia such as letters o
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