Power-Line Carrier Telephony Type ETN-4, Open PDF Document Details Document Type Technical Report Publication Date Jun 27, 1978 Accession Number ADA061850 Entities People Jerzy Rybka Organizations National Air and Space Intelligence Center Tags DTIC Thesaurus Topics Communication Equipment Electrical Equipment Electronic Equipment Foreign Technology Microfiche Microminiaturization Miniature Electrical Equipment Miniature Electronic Equipment Miniaturization Photographic Materials Photography Technology Transfer Telephone Equipment Telephone Systems Terminals