Companies such as Electrolux or Kirby, has been doing this kind of business for more than 40 years. The marketing strategy used by these two companies is quite unique. Agents go house-to-house showing of the Kirby product line and after doing a free demonstration are able to impress the homeowner into buying a unit. Though this household appliance was only introduced to the product line in 1927, it has dealers scattered all over the United States. The company has over 9 models to choose from that is ideal for any location. The standard one which is the upright has a 1000-watt motor allowing it to suck 96 cubic feet of airflow per minute. But, since Booth's time, the face, shape, size, design and engineering of the vacuum cleaning machine have changed tremendously. The basic idea is still there but due to the changing fashions, the development of science and advances in technology, vacuum cleaners have evolved to be a revolutionary invention that altered forever the way people clean. It All Began in a Single Vacuum Cleaner The history of the Electrolux Corporation did not start with the mighty dollar if one would ever interpret it this way, neither was there a start of a big corporate organization with handful of well-pocketed gentlemen ready for turnover of big incorporated capital stocks to start on a highly sophisticated corporation. People should remember that this may be good in the short term but this could cause problems for the machine so it is always best to get it straight from the manufacturer. If the person doesn t know which one to get, it is best to bring a sample in to the store. If there aren t any left at home, getting the model number of the vacuum cleaner and asking the sales clerk for help is the next best option. The manufacturers broaden all possibilities to satisfy consumers when it comes to filling up every customized household cleaning needs. While others complain of the disadvantage of one product feature to another, vacuum cleaners paved way to convenience and removal of soil particles in the house for a smooth feel.