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� Home : ITU-T : Publications : Recommendations : M�Series : M.21
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M.21�:�Maintenance philosophy for telecommunication services �

Recommendation M.21

In force components
Number
 Title Status
M.21 (10/92)
� 		Maintenance philosophy for telecommunication services � In force
�
�
Superseded and Withdrawn components
Number
 Title Status
M.21 (11/88)
� 		Principles for maintenance philosophy and considerations for maintenance strategy for telecommunication services � Superseded

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