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Clean Efficient Natural Gas Ruler12" Energy Conservation Ruler6" Energy Conservation RulerEnergy Efficiency World™ 12" RulerEnergy Efficiency Ruler - Imperial & Metric Units
Save Energy Flexible RulerKids Energy Conservation Mood RulerSchool Supply Kit12" Recycled Plastic RulerFold 'Em Ruler
12" Energy Efficiency Dual Scale Ruler with LED Twist12" Energy Efficiency Ruler with LED Twist12-inch Flexible Mood Ruler