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It is definitely a regional thing, I am in Canada and the 3 prong plugs were never permitted here for dryers or stoves - pure 240 loads like heaters or welders yes though. Our code is adement About not bonding neutral and ground anywhere except at the service... Only read about them in the NEC...
And yes all houses here have 120/240 except very very very old ones, but I would be surprised if any original 120V only houses are left
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