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(d) in respect of records connected with its substantivefunctions, issue a departmental retention schedule prescribingthe periods for which files dealing with specified subjectsshould be preserved, in consultation with the National Archivesof India.years.(ii) The above schedules should be reviewed at least once in 545.7 Stage of recording :Files should be recorded after action on the issues consideredthereon has been completed. However, files of a purely ephemeralnature containing papers of little reference or research value may bedestroyed after one year without being formally recorded.45.8 Classification of records :Files may be recorded under any one of the following classes;(i)Class ‘A’ meaning 'keep and print or microfilm'This classification will be adopted for :(a) files of historical importance;(b) files which qualify for permanent preservation foradministrative purposes and which have to be printed ormicrofilmed because they contain ;(i) a document so precious that its original must bepreserved intact and access to it in the original formmust be restricted to the barest minimum or(ii) material likely to be required for frequentreference by different parties.(NB : Files of CBI are not ordinarily classified ‘A’)(ii)Class ‘B’ meaning “keep but do not print or microfilm”This class will cover files required for permanent preservationfor administrative purpose, but not containing material of thekind mentioned in (i) or (ii) of sub-para (i) (b) above.(iii)Class ‘C’ meaning “keep for specified period only”Page 297 of 297