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Follow the guides to determine if your product fulfils the rules of origin
Product
900290: Lenses, prisms, mirrors & otheroptical elements, of any material, mounted, being parts of/fittings for instr./apparatus (excl.such elements of glass not optically worked), n.e.s. in 90.02
Treaty
EU GSP
Rule
Manufacture in which the value of all the materials used does not exceed 40% of the ex-works price of the product