(a)   Dwellings and residences of any kind, including motels and trailers parks, also schools, hospitals and clinics and other institutions for human care, except where they are incidental to a permitted principal use shall be prohibited in an E heavy commercial-light manufacturing district; provided, that any of the aforesaid uses legally existing in the E district on April 26, 1968, or at the time of the adoption of any amendment to this chapter shall not be classified as a nonconforming use.
   (b)   Any use which is first permitted in the F district shall also be prohibited.
(Ord. 2046, passed 4-11-1968; Ord. 2845, passed 7-26-1982)