| Amendments and corrections |
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| November 1, 1991 | Ext. valid. by 390R2636
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| July 2, 1991 | Modified by 31991R1878
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| April 17, 1991 | Modified by 31991R0938
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| March 14, 1991 | Modified by 31991R0606
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| February 25, 1991 | Modified by 31991R0415
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| November 16, 1990 | Modified by 31990R3291
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| September 14, 1990 | Modified by 31990R2636
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| August 1, 1990 | Modified by 31990R2251
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| July 31, 1990 | Modified by 31990R2221
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| April 24, 1990 | Entry into force - Date pub. + 3 See Art 9
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