From what i know the dangrous presser cookers are from the 40 and 50 here is a rip from a website (In 1941,at the start of WWII, smaller, cast aluminum pressure cookers enjoyed widespread popularity in most American homes. The production of pressure cookers by eleven major manufacturers was tightly regulated during World War II, as aluminum was needed for the war effort, and it wasn't long before the manufacturing of aluminum pressure cookers came to a halt. Cooks held onto their prewar pressure cookers and often several families shared a single cooker. In a time when fuel and food were rationed and shortages were commonplace, the pressure cooker was fast becoming a necessity rather than a mere convenience.
During the war years larger canners made of steel (not the stainless kind) continued to manufactured under approval of the War Production Board for the extremely important victory gardens. Food and fuel shortages forced a return to home canning, and several government programs supported the home front. Read more about vintage and used pressure cookers and safety.
The End of the Beginning
In 1945, with the war ending, the pent-up demand for pressure cookers was tremendous and soon there were 85 US manufacturers. Competition was steep and manufacturers tried to cut costs by producing cheaper, poor quality pressure cookers. Production methods favored quantity rather than quality and these inferior products flooded the market from the late 40's through 50's.
Busy cooks who had replied on their pre-war cookers rushed to buy new ones. New families were in the making and the newly married wives bought pressure cookers so they could cook the same recipes that mom made. Cooks suddenly found exploding pressure bombs in their kitchens and as the word spread about these flawed pressure cooker, people became reluctant to use them. The frequency of pressure cooker accidents founded the familiar expression of "...in a pressure cooker", implying disaster was imminent.
The old horror stories still abound, just as those aged, antique, and vintage pressure cookers still do. A great many of those dangerous old pressure cookers are still around, and are often sold at places such as EBAY, garage sales, and estate sales, as well as passed on from generation to generation as family keepsakes. Unfortunately the problems also persist to this day, as people find these poorly manufactured pressure cookers in the attics and basements of their grandmothers and great aunts and still try to use them.
Decline and Fall One by one manufacturers went out of business as cooks stopped using the post war pressure cookers. Only a few manufacturers could afford to stay in business as sales plummeted. The few diehard pressure cooker users were demanding a better quality pressure cooker, but manufacturers, burdened with overstocked warehouses, were slow to comply with consumer demands. When the new and improved models finally came on the market it was too little, too late and pressure cookery began a steady decline.
Marked with a bad reputation, pressure cooker usage continued to decline, and coupled with newer, modern cooking methods such as the arrival of the microwave oven, the art of pressure cookery nearly disappeared in the US. In the 70's there was a brief resurgence in pressure cooker popularity with many younger cooks drawn to a rural, back-to-nature lifestyle.)
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