File:Tronnier US2645156A (Color-Heliar, 1949).svg
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![File:Tronnier US2645156A (Color-Heliar, 1949).svg](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a6/Tronnier_US2645156A_%28Color-Heliar%2C_1949%29.svg/350px-Tronnier_US2645156A_%28Color-Heliar%2C_1949%29.svg.png?20230504193025)
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