ü ls ▁ ▁District s ▁ ▁There ▁are ▁a ▁number ▁of ▁districts ▁in ▁K ref eld . ▁Each ▁has ▁a ▁municipal ▁representative , ▁with ▁represent atives ▁chosen ▁by ▁local ▁elections . ▁The ▁districts ▁are : ▁ ▁In cor por ations ▁C ities ▁and ▁places ▁that ▁were ▁incorpor ated ▁into ▁K ref eld : ▁▁ 1 9 0 1 : ▁L inn ▁( St ad tre cht ▁since ▁ 1 3 1 4 ) ▁▁ 1 9 0 7 : ▁B ock um , ▁Ver berg ▁und ▁O pp um ▁( all ▁mayor alty ▁B ock um ) ▁▁ 1 9 2 9 : ▁ ▁K ref eld ▁became ▁an ▁independent ▁city ▁ ▁U erd ingen , ▁K ref eld ▁( rece ived ▁municipal ▁law ▁in ▁ 1 2 5 5 / 1 3 4 4 , ▁added ▁H ohen bud berg ▁in ▁today ' s ▁D uis burg ▁district ▁Fri em ers heim ) ▁ ▁F isch eln , ▁K ref eld ▁district ▁ ▁Tra ar , ▁K ref eld ▁district ▁ ▁G elle p ▁and ▁Str atum ▁( in ▁L ank ), ▁K ref eld ▁district ▁ ▁For st wald ▁( Vor st ), ▁K ref eld ▁district ▁ ▁Ben rad ▁und ▁H ül ser berg ▁( H ü ls ), ▁K em pen ▁▁ 1 9 7 5 : ▁Loc ality ▁of ▁H ü ls ▁from ▁K em pen ▁( since ▁ 1 9 7 0 ▁integrated ▁and ▁belonged ▁since ▁ 1 9 2 9 ▁to ▁the ▁K em pen -