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� - <br /> COMPARISON OF THE SOUND OF <br /> THE HELICOPTER WITH NOISE <br /> PRODUCED BY SURFACE <br /> TRANSPORTATION VEHICLES AND 6 <br /> FIXED—WING AIRCRAFT / _ <br /> � ���. .. <br /> (AT DISTANCE NORMALLY ASSOCIATED <br /> WITH SOUND SOURCES) 100 TURBOFAN AIRL <br /> (LANDINGlTAKE <br /> � EXCESSI V E LY ' �� � <br /> i� NOISY DIESEL TRUCK <br /> `�" . <br /> � <br /> �� <br /> . � MOTORCYCLE <br /> � � - - <br /> � �~ 9� -- <br /> U •� � �' �' <br /> � <br /> � t_:J.r r. <br /> �� . , : <br /> ^'��. ^� t <br /> J " ""-�^ _ DIESELTRAIN ` <br /> �: <br /> 4j -�T-�.:::�...� <br /> N O I S Y ti�;;;;:;�;;=. <br /> � � „�-,_�� , — <br /> r:�. <br /> 1 .. 'siL��n <br /> I �� . ` �:1 <br /> —'Y.:::.^ J ■� <br /> J, .a te':--_ <br /> � � ` _, • = ':.:'" 8ELL212 <br /> � �'s� <br /> .� � - <br /> � -"::�.. <br /> IL . ��- <br /> �� � , . 1� .. <br /> ; .r- <br /> �.� BELL 47G <br /> � � 80 L <br /> � C,O ' <br /> ,� ,-z-c�+� _ <br /> ACCEPTAB LE � <br /> � ' � � <br /> FREEWAY TRAFFIC <br /> � s • <br /> • ._1 <br /> BELL 206L ' � � <br /> � �' , <br /> HUGNE <br /> �� ' SPORTS 500D <br /> � QUIET cAR <br /> � / . <br /> HUGHES <br /> �p ENSTROM F28F•P SENTINEL <br /> � �H � . <br /> 1• <br /> ��t��onjHt� e __� AUTO ON STREET <br />