175.321  Application of ss. 175.101-175.121, 175.131-175.151.--Sections 175.101-175.121 and 175.131-175.151 are applicable in relation to each municipality or special fire control district of the state which now has or hereafter establishes a firefighters' pension trust fund or a pension fund for firefighters, regardless of whether the municipality or special fire control district falls within the classification of s. 175.041 and has its firefighters' pension trust fund established under the provisions thereof, or whether the pension fund of the municipality or special fire control district exists under other general or special laws of the state or a local ordinance. The remaining sections of this chapter which apply specifically to the creation of a board of trustees, define its powers, and establish a firefighters' pension trust fund in each municipality or special fire control district, as well as such sections as define the person who shall be entitled to a pension out of such fund and the amount thereof, govern the conditions upon which such pensions shall be allowed, and define the duties of the officers of those municipalities or special fire control districts in relation to such fund, shall not apply to any municipality which had a municipal firefighters' pension trust fund or municipal pension fund for firefighters and police officers on July 1, 1963, or to any special fire control district which now has a firefighters' pension trust fund.