Working Sony readers date back to the PRS-300 and PRS-505 pre touch screen readers as well as PRS-350, PRS-650, PRS-950 and all three PRS-T models. I believe the PRS900 and 950 were the first 7" screen readers commonly available. Their screen format is different than later 7" E-ink screen readers as the screen is the same width as a standard 6" E-ink screen but the height is greater to give the 7" diagonal screen size.
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