This clear plastic giveaway advertises the twentieth anniversary of Personal TEX, Inc., "the integrated LATEX Envitonment." It has a scale of 8 inches divided to 32ds of an inch along the bottom, a scale of 20.5 centimeters divided to millimeters along the top, a scale of inches divided to tenths of an inch along the middle, and a scale of picas/points above this.
The rule was collected at the Joint Mathematics Meeting of the American Mathematical Society and the Mathematical Association of America in January 2015.
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