Drilldown: Techtypes

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Techtypes > Enclosing categories : Patent classification systems or USPC

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Enclosing categories: (Click arrow to add another value)
Subcategories:
None (166) · RU 62b (2)
Keywords:
None (174) · toys (2) · marine (2) · fun (2) · aeronautics (2)
Start year:
None (194)
End year:
None (194)

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