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Re:Apache Foundation disallows use of the Facebook “BSD+Pate... by smarx007 on Sunday July 16, 2017 @06:46AM (#14781444)
A quick search on WIPO:

https://patentscope.wipo.int/search/en/detail.jsf?docId=US90... https://patentscope.wipo.int/search/en/detail.jsf?docId=US19...

Query:

    PA:facebook* AND FP:(Hierarchical user interface) AND CTR:US

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