A collapsible hearing device comprising a base housing and a pair of jointed elongated extension arms constructed and arranged with pivots so located that when said arms are unfolded outward, a pair of earphones fixed to a distal end of each arm engages the ears of a user, and when said arms are folded...http://www.google.fr/patents/US5438626?utm_source=gb-gplus-shareBrevet US5438626 - Collapsible hearing device
