BS EN 60574-21:1994 BS 5817-21: 1994 IEC 574-21: 1992 : Specification for Audiovisual, video and television equipment and systems — Part 21: Video tape leader and trailer for education and training applications
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This part of IEC 574 specifies the minimum requirements for recordings on the leaders and trailers of video recordings to assist users to adjust equipment for optimum performance prior to the start of recorded program material.
BS EN 60574-21:1994 BS 5817-21: 1994 IEC 574-21: 1992 : Specification for Audiovisual, video and television equipment and systems — Part 21: Video tape leader and trailer for education and training applications