FILE - In this March 28, 2020, file photo, David Yee, an NPI mechanical engineer, tests voltage of new batteries at Bloom Energy in Sunnyvale, Calif. The COVID-19 outbreak has prompted companies large and small to rethink how they do business. Bloom Energy makes hydrogen fuel cells. But recently, they have been refurbishing old ventilators so hospitals can use them to keep coronavirus patients alive. (Beth LaBerge/KQED via AP, Pool, File)
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