Before the 1900s, mislabeling of foods and drugs was common, and often intentional. States had primary control over domestically produced products. Many foods and drugs carried unsubstantiated health claims such as cures for cancer or baldness.
Labels did not necessarily reflect what was in the product. In the following pictures, the tomato paste is only 14% tomatoes, and the maple syrup is only 1.5% maple syrup.
Microwave ovens came out of experiments with radar during World War II. This short article discusses its invention, and obstacles to adoption. Today the microwave oven is one of the most popular kitchen appliances.
This is the kitchen of Blandings Dream House in Rocky Mont, NC built after World War II. It is considered a modern kitchen with all the new appliances available at the time.