Propel Doors

We all go through life putting up with little hassles and wish someone would come up with a solution. Sometimes those hassles have been around so long that we assume it's just a part of life. Well, we were sitting around one day in Springfield having a cup of coffee and talk turned to shed doors. The electric garage door opener was invented in 1926, but didn't become popular until after World War II. And now very few people would even think of not having an electric garage door. So why weren't the sliding doors on pole barns and machine sheds automated?