Simple tech terms

From Inventing aviation
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This is a super-category enclosing a variety of plain language terms for early aero technologies which will help search and classify. Parallel formal systems include the CPC system, the very similar IPC system, the USPC system, and the historical French patent classifications and German patent classifications.

Enclosing categories Techtypes
Subcategories Airfoil
Keywords
Start year
End year