The main reason the combination washer-dryers failed was that Aviation Corporation which owned Bendix and all of the patents they developed, patented the concept of the combination AND, most importantly, patented suspending the inside mechanism that needs to move to properly absorb the vibration and dynamic forces during spining. This meant that manufacturers who marketed a combo had to pay royalties to AVCO for each machine sold and were also prevented from designing a machine that could effectively spin at high enough speeds to remove as much water as a separate washing machine before the drying process began. So after the expense of designing a new machine, part of the money that could be used to redesign improvements is taken away in royalties. Then a promising market is dealt a fatal blow by the machines that don't perform efficiently and often need service because of primitive mechanical technology, like the water seal for the heater box in the Westinghouse combo that Greg wrote about. The material available for the seal at the time could not withstand the high temperatures to which it was subjected. When that combo was in use, the seal became damaged by the heat during the drying, allowed water to leak into the heater box which rusted out and needed to be relaced. Unfortunately, at the time, there were not better materials for the seals. This is just one aspect of the types of problems they encountered. The best combos were the early Bendix and the 36" wide Philco combos. Avco poisoned the well for other manufacturers and in so doing, damaged the reputation of all combos, even their own later machines. Of course, AVCO did not care. They sold off Bendix Appliances to Philco which was later bought by Ford Motor Company. AVCO was only interested in Bendix because of Bendix Radio which they needed for airplanes. They bought Bendix, used it, helped it, held it long enough to be able to break it apart to get what AVCO wanted and got rid of the rest. That is why it seems so stupid in retrospect that Whirlpool did not buy Bendix. They would have been able to put a fully functional combo as well as tumbler washers in Sears stores and the history of laundry machines in this country would have been far different than it is. The Bendix Duomatic was a remarkably simple machine as were the Bendix tumbler washers. With nation-wide distribution and service, which Bendix never really had, front loading washers would have had a huge market share and probably challenged the supremacy of top loaders in the industry.