GLS

SYSTEMS FOR AUTOMATIC CIRCULATION CONTROL OF BOOKS AND OTHER ARTICLES OF A LIBRARY AND FOR PREPARATION OF REPORTS ON SUCH CIRCULATION AND OTHER RELATED LIBRARY OPERATIONS AND COMPRISING PRINCIPALLY TERMINAL UNITS FOR DATA ENTRY AND DISPLAY, AND ASSOCIATED COMPUTER AND COMMUNICATION UNITS, AND MICROFILM AND MICROFISCHE READERS; AND SECURITY SYSTEMS COMPRISING PRINCIPALLY PANELS HOUSING ELECTROMAGNETIC FIELD DETECTING ELEMENTS AND HAVING ASSOCIATED ENERGIZING AND CONTROL CIRCUITS, FOR DETECTING UNAUTHORIZED REMOVAL OF BOOKS AND OTHER ARTICLES FROM A LIBRARY; CODED LABELS AND DETECTOR TAGS