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In the 20th century the equipping of bathrooms became a separate industry with a wide variety of special forms of bathroom furniture and fixtures. The materials used are porcelain, enamel, plastic, wood and ______ steel. (stain)
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By 1727, no fewer than 14 types of submarines had been patented in England alone. In 1747 an ______ inventor proposed an ingenious method of submerging and returning to the surface. (identify)
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