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All the petrol generators I've seen/owned were pure sinewave, it's just how they work (basically a very large alternator), I would be very surprised if a petrol generator with modified square output exists, makes no sense, but I'll eat my words if such a beast does exist.
Modified square Inverters exist, because they are easier/cheaper to produce, but that's not relevant to the discussion.
I personally ditched petrol generators about 5 or 6 years ago, solar all the way now, so much better and best of all, dead silent.
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