Spring casing for pipeline support input-output norms set weight ratios, require import-use verification, including 4% zinc allowance.

Spring casing for pipeline support is subject to standard input-output norms requiring M S plate/sheet input of 1.15 kg per 1 kg of finished product and allowing zinc up to 4% of part weight if galvanized; the provision is suspended by public notice and applicants must ensure imported goods are those actually used in manufacture and comply with prescribed input proportions.

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