Abstract: An operation panel of an electronic equipment includes a panel body having at least two openings that have identical shapes and sizes, at least one dummy cover having a shape and a size that fits to any of the at least two openings that have identical shapes and sizes, and an electronic component that is mounted on the dummy cover.

Abstract: Refining of molten pig iron and steel in a converter by oxygen blowing continuously at least four charges in a converter to a carbon content in a range from 0.09 to 0.15% and further subjecting the molten steel to a secondary refining by addition or removal of carbon.

Abstract: A molten iron is continuously refined in a refining vessel of a closed type using a flux composed chiefly of an alkali metal compound so as to decrease the content of P and S to a low level. The alkali metal compound is recovered from the evaporating material and slag generated in the refining and is again used in the refining, while such valuable elements as P, V, etc. may be recovered.The molten iron thus refined can be converted into a steel of high quality in a known oxygen steel making furnace substantially by means of decarburization only and without the use of any flux or with a slight amount thereof.The practice of this invention makes it possible to substantially obviate a substance to be discarded or rejected in the steel making process.

Abstract: A method for refining a molten steel in vacuum, which comprises blowing a non-oxidizing gas or a non-oxidizing gas together with an oxidizing gas into a bath of the molten steel in a refining vessel of a R-H vacuum degassing apparatus at a position between the bath surface and a bath depth of 50 cm (inclusive) from the bath surface in an almost horizontal direction.