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It would appear to be these, by a lesser-known Chinese manufacturer:

http://en.szhxmos.com/mos/138.html

It might be easier to find Vishay IRF740s, which appear to have similar specifications.

Both of those seem a little light for this application (400 V leaves little head room for ringing/spikes), and 10 A seems light for 2 kW continuous operation. But that's to be expected for an inverter in the price segment I'm imagining.

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