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With everything from a mist curtain designed to cool people off in the oppressive summer heat to hydrogen fuel cell vehicles and robots delivering refreshing drinks, companies are sparing no expense as they gear up for a marketing bonanza. Panasonic hopes to see Hospi robots guiding hotel guests to their rooms and also providing room service. Toyota Motor Corp. has a blueprint for hydrogen fuel cell vehicles or buses, which only emit water, to ride around the Olympic venues in an official capacity. The automaker also hopes to promote the Toyota Mirai -- the world's first mass-produced hydrogen fuel cell vehicle that went on sale in December 2014 -- to Olympic officials and visitors.