What are subcombinations in the context of patent classification?

In patent classification, subcombinations refer to components or features that can be part of a larger invention or have utility on their own. MPEP 903.02(b) describes two types of subcombinations: Subcombinations Specialized to Basic Subject Matter: The MPEP states, “Each type of basic subject matter may have subcombinations specialized to use therewith; e.g., the crushing…

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