Japan is the biggest buyer, with Japan Airlines placing an order for 10 so far this year.

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Apple's application with the U.S. Patent and Trademark Office describes a process for placing an order and then notifying customers when an order is ready to grab at a pick-up station.

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Hough is placing an order with Purfresh, which recently switched to a rental system for the generators, for 27 more ozone cabinets.

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