Yes, microwaves were available in the 1970s. The microwave oven, as we know it today, was first invented in 1946 by Dr. Percy Spencer, an engineer at Raytheon Corporation. However, it took a few decades for microwave ovens to become popular household appliances.
By the 1970s, microwave ovens had become more affordable and widely available for consumer use. They gained popularity during this time as a convenient and efficient way to cook and reheat food. The technology continued to improve over the years, and by the 1970s, microwaves had already become a common fixture in many kitchens around the world.