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Energy Efficiency World™ 12" RulerEnergy Efficiency Ruler - Imperial & Metric UnitsSave Energy Flexible RulerKids Energy Conservation Mood RulerSchool Supply Kit
12" Recycled Plastic Ruler12" Energy Efficiency Dual Scale Ruler with LED Twist12" Energy Efficiency Ruler with LED Twist12-inch Flexible Mood RulerClean Efficient Natural Gas Ruler
12" Energy Conservation Ruler6" Energy Conservation Ruler