.
.
The Model AE (or E-Automatic as it originally was called) was introduced in the late summer or early fall of 1956, not 1955.
The disastrous Model T came out some time in 1956 to replace the Model E as a more competitively priced bargain machine. It was sold for a VERY short time, probably just a couple of months when it proved to be a huge flop. (An Electrolux oldtimer told me that some salesmen didn't even show the Model T to prospects.)
The Model S came out right afterward in late 1956 as a more stylish and dainty economy model, and after it the Model F (Automatic) in late 1957 or early 1958, and then the Model R in late 1958 or early 1959. You can look at these models and get the release dates at my website. See link.
The ambiguity of release dates is due to two things -- 1. Research into stacks of Electrolux literature did not reveal exact dates. 2. It appears that various models were introduced in some parts of the country earlier than others (most likely urban areas before rural areas).
[URL unfurl="true"]http://www.1377731.com/lux/luxlxs.html[/URL]
