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6" Energy Conservation RulerEnergy Efficiency World™ 12" RulerEnergy Efficiency Ruler - Imperial & Metric UnitsSave Energy Flexible RulerKids Energy Conservation Mood Ruler
School Supply Kit12" Recycled Plastic RulerFold 'Em Ruler12" Energy Efficiency Dual Scale Ruler with LED Twist12" Energy Efficiency Ruler with LED Twist
12-inch Flexible Mood RulerClean Efficient Natural Gas Ruler12" Energy Conservation Ruler