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243_MasterPieces_04b.qxd  4/18/03  7:08 PM  Page 200





           200    Masterpiece 4 • PneumADDic II
                  Dual Motor Switch Step 18

































                  The Pump Walls































                  The compressor for PneumADDic II consists of two Pump Wall sub-assemblies, each of
                  which contains two pumps. First, we will construct the walls of the pumping mechanism.
                  Remember to build two of these.
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