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The Hubbell outlet appears in a 1915 electrical goods catalog, so it goes back at least that far, but the blade-style quick attachment we all know was only one of several different styles/formats shown, which makes me think it was still very new and very far from common much less universal in a time when cords still draped from the ceiling.
An original 1905 installation of a baseboard outlet is not impossible, but it would probably look like this...
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