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Shares of Apple Inc. (Nasdaq: AAPL) are down marginally in premarket hours on news that Ericsson sued the tech giants over 41 alleged cases of patent infringement. The specified patents are central to the functionality of Apple devices, including the popular iPhone. The company has also sent invitations to an event on March 9, telling participants to "Spring Forward." The event, which coincides with Daylight Savings Time, is one month before the company has plans to launch the Apple Watch.