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  1. I have a framed magazine page from (I think) the 1920s. It is an advertisement for a Lorain Oven Heat Regulator. The headline on the ad is “Sterilize—Don’t Cook When Canning.” A woman is removing filled canning jars from an oven. The USDA did recommend against oven canning, but the practice persisted. I wonder how many people got sick.

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