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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 Ruler12" Energy Efficiency Dual Scale Ruler with LED Twist
12" Energy Efficiency Ruler with LED Twist12-inch Flexible Mood Ruler