expense." 39 A key ingredient to the Hammond organ's success was the use of dealerships. The position of the drawbars, combined with the switches selected by the key pressed, determines which tonewheels are allowed to sound. Account, search, maps, youTube, play, news, gmail. As well as clocks, his early inventions included three-dimensional glasses and an automatic bridge table shuffler. The organ was manufactured in a variety of different chassis, with the last two digits of the specific model number determining the style and finish of the instrument. Some drawbar settings have become well-known and associated with certain musicians. Some are similar to a pipe organ, but others are unique to the instrument. Several dedicated organ dealers set up business in the United States and there was a bi-monthly newsletter, The Hammond Times, mailed out to subscribers. Production of the old Model A cases stopped, but the older model continued to be available as the AB until October 1938.