00641nam0 2200217 450 00001012620180703140625.020080421d1958----km-y0itay50------baengGBa-------001yyAircraft communications systemsJ. H. H. GroverLondonHeywood & company1958127 p.ill.22 cm629.13418Grover,John Herbert Hardy630993ITUNIPARTHENOPE20080421RICAUNIMARC000010126629.134/10013475PISTAircraft communications systems1203770UNIPARTHENOPE