Yep, used a stainless steel one. Works great. I'm from Russia.

Judging by the quoted patent dates, guessing it was most useful when mothers were still cooking for large families (and so had multiple pans/pots going on).

It's still useful if buying raw milk is cheaper then getting pasteurized one from the store.

Nowhere in the developed world is that true though. Economy of scale forbids it.

Unless you happen to be a dairy farmer -- when I was a kid and we went to my grandfather's farm, he'd draw a pitcher of milk right from the holding tank and put it in the 'fridge for drinking. I'm not old enough to remember drinking it, but my older sister said it tasted better than store bought.

I live on a dairy. We sell raw milk self-serve (bring your own container too) for $3/gallon. Kansas.