IEC-60050-821 › Complete Document History
International electrotechnical vocabulary - Part 821: Signalling and security apparatus for railways
Complete Current Edition: |
2ND EDITION - Part 821: Signalling and security apparatus for railways - Nov. 1, 2017
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Obsolete Revision Information: |
1ST EDITION - INTERNATIONAL ELECTROTECHNICAL - April 1, 1998
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