kuparikantaisissa

Could you clarify what kuparikantaisissa refers to? I’m not sure if it is a place, a concept in a field (for example science or art), a historical term, or something else. If you have a source or context (e.g., a book, article, or field where the term is used), please share it. Once I know what it denotes, I can write a concise, neutral, wiki-style article under 300 words.