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一个英语语法问题As it had been with peepshow devices such as the Kin

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一个英语语法问题
As it had been with peepshow devices such as the Kinetoscope and the Mutoscope,which was a similar machine that reproduced motion by means of successive images on individual photographic cards,这句很长其实很简单,我只想问那个which能指代Kinetoscope,Mutoscope两个东西吗?后面为什么还是加的was?
which不指代Kinetoscope,Mutoscope两个东西,代指it,所以谓语用单数.