When did Yamaha buy NEXO?

Could you please elaborate on the timing of Yamaha's acquisition of NEXO? I'm curious to know when exactly this transaction took place. Was it a recent purchase, or did it occur some time ago? Could you provide a specific date or perhaps a range of dates that might indicate when Yamaha bought NEXO? This information would be greatly appreciated as it would help me understand the chronology and context surrounding this business decision. Thank you for your assistance.