Exemption notification interpretation: cupro rayon fibre was not treated as viscose fibre, and later relief could not operate retrospectively.

Cupro rayon staple fibre was treated as a distinct variety from viscose fibre for exemption purposes, because the two differ in manufacture, characteristics and use, and a notification limited to viscose fibres could not be extended merely because both fall within the broader genus of regenerated cellulose. The later exemption notification for the imported goods could not be applied retrospectively, as a subsequent enlargement of exemption operates only prospectively unless the notification expressly provides otherwise. The import was therefore outside the earlier exemption, and the later relief could not be read back to cover it.

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Issues: (i) whether cupro rayon staple fibre could be treated as viscose fibres for the purpose of exemption under Notification No. 388-Cus. dated 2-8-1976; and (ii) whether the subsequent exemption for the imported goods could operate retrospectively.

Issue (i): whether cupro rayon staple fibre could be treated as viscose fibres for the purpose of exemption under Notification No. 388-Cus. dated 2-8-1976

Analysis: The imported goods were shown to be regenerated cellulose, but the materials on record indicated that cupromonium fibre and viscose fibre are distinct varieties of rayon. They differ in manufacturing process, characteristics and uses, and the notification extended benefit only to the specified category of viscose fibres. The fact that both belong to the broader family of regenerated cellulose did not justify treating them as identical for exemption purposes.

Conclusion: The goods were not covered by the expression viscose fibres in Notification No. 388-Cus. dated 2-8-1976, and the finding of the appellate authority on this issue was incorrect, in favour of Revenue.

Issue (ii): whether the subsequent exemption for the imported goods could operate retrospectively

Analysis: The later notification was issued after the relevant import and was relied upon only to show that the class of goods was subsequently brought within the exemption. A later enlargement of exemption cannot be given retrospective effect in the absence of any such indication in the notification.

Conclusion: The subsequent exemption could not be applied retrospectively, in favour of Revenue.

Final Conclusion: The appeal succeeded because the imported cupro fibre was held not to be covered by the earlier exemption notification and the later exemption could not be read backward to extend relief.

Ratio Decidendi: An exemption notification confined to a specific variety of fibre cannot be extended to a distinct variety merely because both fall within a broader genus, and a subsequent exemption does not operate retrospectively unless expressly provided.

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