Re: Vintage Electrolux vacuum cleaner (Model Z25)
Those 2 pin plugs do exist in an earthed form even with keying.
I own a power supply with such a plug. It is the same pitch as a 1950s Bush radio mains lead and would trip the RCCD if the earth contact touched the chassis on one of those.
Voltage selection is achieved by rotating the keyed plate covering a circle of pins to select the input voltage.
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