Perpetuum mobile: verschil tussen versies

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== Externe link ==
* {{en}}[http://books.google.com/books?id=194DAAAAMBAJ&pg=PA108&dq=1954+Popular+Mechanics+January&hl=en&sa=X&ei=At8LT83yFIWSgQf3wMGtBw&ved=0CDAQ6AEwAA#v=onepage&q=1954%20Popular%20Mechanics%20January&f=trueifqzkjdgkkgehtdie/fdsoahzeifgsdkjdhgqyd5535820 "Perpetual Motion - Just Isn't."] ''Popular Mechanics'', Januari 1954, pag.&nbspbfqdnbvgdshhshfdjugfedyefeidsvszjsgekjsvzjc:bc;108–111.
 
{{Commonscat|Perpetuum Mobile}}