Inventors and discoverers

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A person who designes engines and machines is a (an) ... .

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A person who repairs and maintains machinery, motors is a (an) ... .

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A person whose profession is the planning of the decoration and furnishings of the interior of houses, shops is a (an) ... .

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A person who investigates unknown regions is a (an) ... .

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A person who creates or discovers a new method, form, device or other useful means that becomes known as an invention is a (an) ... .

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A person who, or thing that, constructs something is a (an) ... .