General. In any Limited Manufacturing District, all open storage of junk, junk cars, scrap metal, waste paper, concrete products, and similar used materials shall be completely screened from view at normal eye level from any street, or from any premises other than that on which located. Any other use conducted outside a completely enclosed building, except an open use permitted in General Business Districts, shall, if visible at normal eve level from any point within a residence district and less than 200 feet distant, be completely screened from such view, unless separated from said district by a railroad or by a street having a width of 40 feet or more. Notwithstanding the foregoing, any existing open use which, under the terms of § 280-3.3 of this Bylaw, is exempted in whole or in part from the enclosure of use requirements in § 280-5.3 shall be completely screened from view at normal eye level from any street or from any premises other than that on which it is located, if such open use, in the case of a new use, would be required under § 280-5.3 to be conducted wholly within a completely enclosed building or occupies an area in excess of that which would be permitted for open use under § 280-5.3. Screening required under this paragraph shall be by a dense evergreen planting, fence, or other suitable visual barrier.