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Many cars in the 1920's and 1930's had thermostat controlled shutters in front of the radiator, in some cases the shutters were also the grille. Depending on the design of the car the shutters were horizontal or vertical.
Look up photos of 1930's Packards. They used two panels of vertical chromed louvers. With the car at rest and engine off and cool, the grilles look like solid metal sheets with some vertical grooves.
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