Re the first picture—up to the early 1970s in northern California, these were used extensively on construction sites. At temporary power poles, typically there were a pair of these, one receptacle was labeled “110” and the other was labeled “220”. That way extension cords could be used for either voltage. (Never mind the hazards.)
This was at a time when CALOSHA was just comin’ up to steam, and inspectors were busy with site inspections and issuning citations.
