PDD Jan 2016
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C3-12 PENCIL AND PLYWOOD
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C5-14 ROCKET TRIKE
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G1-35: MASS ON SPRING - EFFICIENT MODEL
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G3-28 SUSPENDED SLINKY
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G3-43 WHIP
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H1-01 BELL IN VACUUM
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H1-31: SOUND LEVEL METER
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H2-33: SPEAKER AND EXPONENTIAL HORN
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H3-12: ROARING TUBE - 4 FT
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H3-14 TWIRL-A-TUNE
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H3-17 FLAME TUBE
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H3-61 BEAKER BREAKER
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H3-71 STROKED ALUMINUM ROD
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I3-18: VACUUM BAZOOKA
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I4-14: CHANGE OF STATE WITH BANG
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I4-31 ICE BOMB
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J4-51: THEREMIN
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K2-62 CAN SMASHER - ELECTROMAGNETIC