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The certificate of competency for operation of Block Instrument shall be valid for a period of ........ years
Three
Four
Two
None of the given options
Three
According to Indian Railway General Rules and operational manuals, the certificate of competency for the operation of Block Instruments is valid for a period of three years.
According to Indian Railway General Rules and operational manuals, the certificate of competency for the operation of Block Instruments is valid for a period of three years.
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