| http://www.w3.org/ns/prov#value | - The central unit 60, which is shown in FIG. 4, may contain for example a key switch for the main power supply, a key switch to turn all push buttons off, a push button for a lamp test (if actuated all display lamps of the system should flash up thus checking whether all lamps are operable), and further push buttons for other purposes, for example to deliver an input (like EO) to the storage.
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