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Electromagnet
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Diagram of iron nails dipped in copper sulphate solution
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Electromagnet
Diagram of Iron Nails Dipped in Copper Sulphate Solution - YouTube
How To Solder: A Complete Beginners Guide - Makerspaces.com
How to build a simple soldering iron · One Transistor
Learn Electromechanical Relay Operation Step by Step | Engineer Calcs
Patent EP2224783A2 - Soldering iron with replaceable tip - Google Patents