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ISO 6692:1981 Cycles — Marking of cycle components
ISO 4143:1981 Shipbuilding — Inland vessels — Open rowing lifeboats
ISO 6989:1981 Textile fibres — Determination of length and length distribution of staple fibres (by measurement of single fibres)
ISO 5314:1981 Fertilizers — Determination of ammoniacal nitrogen content — Titrimetric method after distillation
ISO 5890:1981 Manganese ores and concentrates — Determination of silicon content — Gravimetric method
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