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Indeed, the Labor Department ruled that “customer and aggregate United States imports of articles like or directly competitive with the cylindrical solar panel systems by Solyndra LLC have increased.”

While Abound and Solyndra have much in common — both were solar-panel makers, received generous federal loans and ended up in bankruptcy court — they offered different products.

Abound made thin film cadmium telluride solar modules that turn solar energy into electricity, and the company said its technology performed better than crystalline silicon in low light and high-temperature conditions. By contrast, Solyndra made cylindrical panels that were new to the market and unproven.