todays headline news contains a link "Sound-Beam Inventor Wins $500,000 Lemelson-MIT Award" http://www.msnbc.msn.com/id/7536267
, saying that a lonesome guy invented the "sound-beam". But Sennheiser http://www.sennheiser.com/sennheiser/icm_eng.nsf/root/09859
already offers something like that since 2000, so who was the first ? Or maybe both invented it at the same time ?