File:Changing control panel on IBM 650 card reader.jpg
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![File:Changing control panel on IBM 650 card reader.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/6/60/Changing_control_panel_on_IBM_650_card_reader.jpg/440px-Changing_control_panel_on_IBM_650_card_reader.jpg?20111118170625)
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