http://dewey.info/scheme/a14/ en
621.38 Electronics, communications engineering
621.384 Radio and radar
621.384028 Auxiliary techniques and procedures; apparatus, equipment, materials 621.384092 Radio engineers 621.3841 Amateur radio (Ham radio) 621.3845 Radiotelephony 621.3848 Radar
http://dewey.info/scheme/a14/ vi
621.38 Điện tử, kỹ thuật truyền thông
621.384 Vô tuyến điện và rađa
621.384028 Kỹ thuật và quy trình phụ trợ; máy móc, thiết bị, vật liệu 621.384092 Kỹ sư vô tuyến điện 621.3841 Vô tuyến điện nghiệp dư 621.3845 Điện thoại vô tuyến 621.3848 Rađa
http://dewey.info/scheme/a14/ it
621.38 Ingegneria elettronica, delle comunicazioni
621.384 Radio e radar
621.384028 Tecniche e procedure ausiliarie; apparecchi, attrezzature, materiali 621.384092 Radiotecnici 621.3841 Radiofonia amatoriale (Stazioni di radioamatori) 621.3845 Radiotelefonia 621.3848 Radar
http://dewey.info/scheme/edition/e23/ en
621.38 Electronics, communications engineering
621.384 Radio and radar
621.3840285572 Radio--engineering--data representation 621.3840288 Maintenance and repair 621.384092 Radio engineers 621.3841 Specific topics in general radio 621.3842 Radiotelegraphy 621.3845 Radiotelephony 621.3848 Radar
http://dewey.info/scheme/edition/e22/ de
621.38 Elektronik, Kommunikationstechnik
621.384 Funk und Radar
621.3840285572 Funk--Technik--Datenrepräsentation 621.3840288 Instandhaltung und Reparatur 621.384092 Funktechniker, . . . 621.3841 Einzelne Themen zu Funk 621.3842 Funktelegrafie 621.3845 Funkfernsprechtechnik 621.3848 Radar
Dewey Decimal Classification
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