| http://www.w3.org/ns/prov#value | - The head 391 may be composed of a high-resistance metal or alloy, such as molybdenum or stainless steel and is connected to a heating power supply (not shown) to be supplied with a power (generally a voltage of 50-500 volts, preferably 80-200 volts; a current of 0.1-10 A, preferably 1-5 A).
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