Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 70/301Granted Patents in 70/301
Use the links above or do an advanced search in ppubs for:
(70/301.ccls. or 70/302.ccls. or 70/303r.ccls. or 70/303a.ccls. or 70/304.ccls. or 70/305.ccls. or 70/306.ccls. or 70/307.ccls. or 70/308.ccls. or 70/309.ccls. or 70/310.ccls. or 70/311.ccls. or 70/312.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.