Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 347/200Granted Patents in 347/200
Use the links above or do an advanced search in ppubs for:
(347/200.ccls. or 347/201.ccls. or 347/202.ccls. or 347/203.ccls. or 347/204.ccls. or 347/205.ccls. or 347/206.ccls. or 347/207.ccls. or 347/208.ccls. or 347/209.ccls. or 347/210.ccls.)
This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find patents or patent applications in those subclasses.