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Ford of Cologne "lameller"
The only thing I've seen which remotely conforms to your query is Ford of Cologne's "lameller" grille,developed for their Capri.It is an otherwise "wide-open" grille constructed of airfoil elements which are designed to stall during high-speed driving,with the stalled,turbulent flow impeding incoming air,effectively "blocking" the grille until velocity falls to "urban" levels.We kicked this one around a year or so ago.
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