The Federal Communications Commission on Thursday proposed a $34.9 million fine, its largest ever, against a Chinese electronics company for illegally marketing cellphone and radio jamming equipment online in the United States. The company, C.T.S. Technology of Shenzhen, China, offered nearly 300 models of signal-jamming devices for sale to American consumers over two years, the commission said, marketing some of them as approved by the F.C.C. for consumer use.
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