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For the purpose of this Convention the term „night” signifies a period of at least eleven consecutive hours, including an interval prescribed by the competent authority of at least seven consecutive hours falling between ten o'clock in the evening and seven o'clock in the morning; the competent authority may prescribe different intervals for different areas, industries, undertakings or branches of industries or undertakings, but shall consult the employers' and workers' organisations concerned before prescribing an interval beginning after eleven o'clock in the evening.