Replaceable snap-together wires, headphones, headband and plug comprise a modular stereo headphone apparatus. Sealed headphones are provided with walled receptacles to receive mating removable clips secured to the ends of connecting wires. Each clip is molded to the wire insulation and around the wire...http://www.google.es/patents/US4499593?utm_source=gb-gplus-sharePatente US4499593 - Modular stereo headphones
