Penelope Schofield, the West Sussex coroner, said there was "institutionalised abuse" at Orchid View care home in Copthorne.
She said those involved in the neglect of pensioners at the now defunct home should be "ashamed" as it was announced a serious case review has been set up.
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The world's first ever 'hole in the wall' was installed in Enfield, north London, on June 27 1967.