Whenever the owners of 50% or more of the frontage in any district shall present to the Board of Commissioners a petition duly signed and acknowledged requesting an amendment, supplement, change, modification or repeal of the regulations prescribed for or of the Zoning Map including such district, it shall be the duty of the Board of Township Commissioners to hold a public hearing thereon and cause notice thereof to be given in the manner prescribed in §
350-255.
All ordinances or parts of ordinances which are inconsistent
herewith are hereby repealed.