And Joost Akkermans, spokesman for Philips, who make a wide range of gadgets from shavers to vacuum cleaners, added that because it was on "ongoing case" he could not comment further.Media-Saturn-Holding Gmb H, which operates the Saturn and Media Markt consumer electronics retail chains, likewise confirmed it had been involved.All three firms have said they are cooperating with the inspectors from the EU's executive arm.

Their investigation comes as traditional electronics retailers wage a fierce battle with online rivals such as Amazon.
The EU antitrust regulator can fine companies up to 10 percent of their global revenue for breaking EU rules.
In the cae of Samsung, which boasts revenue in excess of £150billion, the fines could amount to £15billion.
Or maybe you're planning a night of cocktails and dancing? Instead, we are witnessing a renaissance in a rather different sort of old-fashioned fun.
EU competition watchdogs have been investigating whether prices of goods made and sold by the companies are being artificially inflated online.
If proven, the firms could face fines of up to £15billion.
Their probe comes in the middle of the busiest time of year for online shopping, with Brits alone spending billions in the run-up to Christmas.
Visa Europe forecast that this year's Cyber Monday would see UK online shoppers spend £450m in a single day.
The inspectors targeted companies that they believe were deliberately restricting online sales of their products to drive up prices or making them unavailable at shops that sold them cheaply.