HELSINKI (Reuters) - Nokia's new Lumia smartphones are trickling into the market and early signs suggest they may sell well enough to give the handset maker more time in its fight against industry leaders Samsung and Apple. But investors shouldn't expect a quick turnaround for the struggling Finnish cellphone maker, with rival gadgets like mini tablet computers vying for consumers' attention, analysts said. "Positive reviews are a great start but as we have seen many times before these won't deliver strong sales volumes on their own," said Pete Cunningham, an analyst at research firm Canalys. ...

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