Copper
Pipe (Fluid Conveyance) / Aluminium
Copper / Manufactured Goods
Insulator (Electricity) / Electricity
Hydrogen / Hydrochloric Acid
Copper / Electromagnetism
Electric Current / Copper
Printed Circuit Board / Coaxial Cable
Aluminium / Electrical Conductor
Pipe (Fluid Conveyance) / Copper
Wire / Pipe (Fluid Conveyance)
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