what does "established" represent in this sentence

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/10 18:50:45

what does "established" represent in this sentence
We are a well established company dealing in all kinds of electrical products -lightning and cables.
in the above sentence,is "established" necessary?what's the meaning of its exist.

well established
well-founded,has a secure basis
基础雄厚的

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