which 질문입나다ㅠㅠㅠ

the same goes for the computer mouse, the patent for which expired in 1980, and rollerblad skates, the patent for which expired in 1986....이런식인데 왜 포 위치 뒤에 완전한문장이안오고 주격관계대명사처럼 쓰인거죠?ㅠㅠㅠㅠㅜㅜ

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