Bombay Industrial Relations Act (extended to Gujarat), 1946
Notwithstanding anything contained in section 23, if there is any alteration in the local area or areas,— (a) an approved union in an industry in the altered local area or areas, or (b) where two or more approved unions exist in an industry in the altered local area or areas the union having the largest membership, whether by agreement of the other approved unions or as determined by the Registrar after such inquiry as he deems fit,