| http://www.w3.org/ns/prov#value | - In filling the through holes 37 with the sealing material 38 in the hole sealing step, the method of irradiating the sealing material 38 a with the light beam L5 from the halogen lamps does not require a special power supply and other apparatuses such as a laser generator, and the like, thereby permitting energy-saving hole sealing at low cost.
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