The European Union's antitrust watchdog had sent a Statement of Objections to a number of companies, alleging they fixed the prices of flat glass products, which is used by the building sector.
The price fixing restricted competition in the market in violation of EU rules outlawing restrictive business practices, the commission said.
The formal step in European antitrust investigations was taken after several inspections carried out two year ago.
Under the procedure, the companies concerned have two months to defend themselves in writing. They can also ask the commission to hear their case at an oral hearing, which usually takes place about one month after the written reply has been received.
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