only to be used as a firework imported for portek ltd by excelsior fireworks,saffron walden.翻译？

excelsior fireworks,saffron walden？？总之是一间烟火公司
前面应该还有一个主语吧？
(The) A is only to be used as a firework ,(which is) imported for portek ltd by exelsior fireworks, ...
由excelsior fireworks,saffron walden公司出口到portek公司的(货品)A只能(被)用作烟火用途。
这个im