By Matt Novak

Throughout the 20th century, radio nerds were trying to figure out how to build the perfect headphones. Over-the-ear varieties could get hot and sweaty. …

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Source:: http://feeds.gawker.com/~r/gizmodo/full/~3/oDsO_Fl3Ens/these-headphones-from-1927-look-so-much-worse-than-earb-1686077787