Hierarchy/Derived subclasses
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uspto searches
Patent Apps in 70/391Granted Patents in 70/391
Use the links above or do an advanced search in ppubs for:
(70/391.ccls. or 70/392.ccls. or 70/393.ccls. or 70/394.ccls. or 70/395.ccls. or 70/396.ccls. or 70/397.ccls. or 70/398.ccls. or 70/399.ccls. or 70/400.ccls. or 70/401.ccls. or 70/402.ccls. or 70/403.ccls. or 70/404.ccls. or 70/405.ccls. or 70/406.ccls. or 70/407.ccls. or 70/408.ccls. or 70/409.ccls. or 70/410.ccls. or 70/411.ccls. or 70/412.ccls. or 70/413.ccls. or 70/414.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.