Here are several links to the inventions and their descriptions. I can't find any references to "magnetic", but I think these devices that are patented are simply that actual vehicle which carries the "disposable cleaning sheets". If the disposable cleaning sheets are to contain an OBJ magnetic micro-array, then they would be the subject of a quite separate patent - and I can't find any on patentscope. But who knows.
https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2016060942
https://patentscope.wipo.int/search/en/detail.jsf?docId=US130498562
https://patentscope.wipo.int/search/en/detail.jsf?docId=EP173911992
https://patentscope.wipo.int/search/en/detail.jsf?docId=EP173911993
https://patentscope.wipo.int/search/en/detail.jsf?docId=EP173516726
Here are several links to the inventions and their descriptions....
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