| http://www.w3.org/ns/prov#value | - Each step of the test procedure and operating instructions is displayed as a request on a computer-generated TV display 20 (see FIG. 1) beside which are four buttons 18. (Messages and languages other than English can also be written by reprogramming the appropriate PROM.) As each message appears, only those buttons which relate to performing the appropriate task are enabled.
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