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
Dewey Decimal Classification
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