Strict construction of exemption notifications prevents retrospective relief where polypropylene tow is distinct from staple fibre.

Polypropylene tow was held not to fall within Notification No. 64/77 as amended because tow and polypropylene staple fibre were treated as distinct commodities: tow is an entangled mass of fibres, while staple fibre results from a further process. The technical material did not establish that they were the same goods. A later exemption for man-made staple fibres made out of tow could not be applied to the earlier period, as exemption notifications are construed strictly and do not operate retrospectively unless expressly stated. The duty demand was therefore sustained, and the revision failed.

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Issues: Whether polypropylene tow was covered by Notification No. 64/77 dated 15-4-77 as amended and was therefore exempt from duty, and whether a subsequent exemption notification could be applied retrospectively to the material period.

Analysis: The classification dispute turned on whether polypropylene tow was the same as polypropylene staple fibre. The finding recorded was that tow and staple fibre are different commodities, tow being an entangled mass of fibres and staple fibre being obtained in a subsequent process. The technical material relied upon did not establish identity between the two. The later notification exempting man-made staple fibres made out of tow was issued only subsequently and could not govern the earlier period, since an exemption notification is to be construed strictly and does not operate retrospectively unless so provided.

Conclusion: Polypropylene tow was not covered by Notification No. 64/77 dated 15-4-77 as amended for the relevant period, and the subsequent notification did not confer retrospective exemption. The demand of duty was sustained and the revision failed.

Ratio Decidendi: An exemption notification must be construed strictly, and where the goods covered by the notification are distinct from the goods in question, a later exemption cannot be applied retrospectively in the absence of express provision.

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