Book, US Government Printing Office, Organizational Maintenance Manual - Radio Sets AN/VRC 12 43 44 45 46 47 48 & 49, Dec 1961 Significance Handbook for equipment previously used by the Regiment Physical description Soft covered book detailing installation and maintenance instructions for Radio Sets AN/VRC 12 43 44 45 46 47 and 49 Inscriptions & markings TM 11-5820-401-20 Subjects book, radio training