This is a very informative look at how the vacuum cleaner started out and how it came to be such a well known appliance. It also has a look into how it works.
A look into the way the sewing machine started out and how it has developed into one of the world's most popular inventions. There is also a little bit on how it works as well.
A look into the history and changes of the refrigerator as well as how the refrigerator has changed so many lives and indeed how a vast majority of homes and business keep food fresher for longer periods of time.