77092201
Jan 26, 2007
Aug 25, 2009
Public address systems and instruments; mobile public address systems and user guides provided as a unit therewith; mobile public notification systems comprised of audio recordings featuring emergency messages, audio speakers, electric audio playback units, sirens, video display units, telecommunications transmitters and receivers, and electronic transmitters and receivers for sending and receiving text messages and phone calls to deliver messages, and user guides provided as a unit therewith
Electrical and Scientific Apparatus