kw.\*:("EMETTEUR DIRECTIONNEL")
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A NOVEL ACOUSTIC RADIATOR.PRETLOVE AJ.1974; ULTRASONICS; G.B.; DA. 1974; VOL. 12; NO 6; PP. 263-268; BIBL. 5 REF.Article
THE DEVELOPMENT AND TESTING OF A HIGHLY DIRECTIONAL DUAL-MODE ELECTRONIC SIREN.FISCHER RL; TOTH DD; BLOMQUIST DS et al.1978; NATION. BUR. STAND., SPEC. PUBL.; U.S.A.; DA. 1978; NO 480-28; PP. 1-43; BIBL. 9 REF.Serial Issue
PROPOSALS FOR THE DIRECTIVE CHARACTERISATION OF ELECTROACOUSTIC EMITTERSPFRETZSCHNER J; MORENO A.1981; APPL. ACOUST.; ISSN 0003-682X; GBR; DA. 1981; VOL. 14; NO 3; PP. 197-205; BIBL. 7 REF.Article