6.3.3 * Auditory ALARM SIGNALS - Rational
6.3.3.1 * Characteristics of auditory ALARM SIGNALS 6.3.3.2 * Volume of auditory ALARM SIGNALS and INFORMATION SIGNALS
6.3.3.1 * Characteristics of auditory ALARM SIGNALS
6.3.3.2 * Volume of auditory ALARM SIGNALS and INFORMATION SIGNALS