5 . ▁Between ▁ 1 9 7 1 ▁and ▁ 1 9 7 4 ▁the ▁local ▁government ▁reform ▁incorpor ated ▁ 5 ▁neighbour ing ▁communities ▁into ▁the ▁city ▁of ▁Bru chs al , ▁including ▁the ▁cities ▁of ▁He id els heim ▁and ▁O berg rom bach . ▁Under ▁a ▁further ▁reform ▁in ▁ 1 9 7 3 , ▁Bru chs al ▁was ▁incorpor ated ▁into ▁the ▁district ▁of ▁Kar ls ru he . ▁Thus ▁Bru chs al ▁lost ▁its ▁district ▁seat ▁status , ▁though ▁it ▁still ▁remains ▁a ▁major ▁economic ▁centre ▁of ▁the ▁region . ▁ ▁Local ▁government ▁reform ▁In ▁the ▁local ▁government ▁reform ▁in ▁the ▁early ▁ 1 9 7 0 s ▁the ▁following ▁cities ▁and ▁towns ▁became ▁part ▁of ▁the ▁city ▁of ▁Bru chs al . ▁Before ▁the ▁district ▁reform ▁they ▁were ▁all ▁part ▁of ▁Bru chs al ▁district . ▁▁ ▁July ▁ 1 , ▁ 1 9 7 1 : ▁▁▁▁ ▁O berg rom bach ▁and ▁Unter g rom bach ▁ ▁July ▁ 1 , ▁ 1 9 7 2 : ▁▁▁▁ ▁Bü chen au ▁and ▁Hel ms heim ▁ ▁October ▁ 1 , ▁ 1 9 7 4 : ▁ ▁He id els heim ▁ ▁Dem ograph ics ▁ ▁Fig ures ▁reflect ▁the ▁city ▁limits ▁at ▁the ▁time ▁and ▁are ▁estimates ▁or ▁Census ▁data ▁( ¹ ), ▁or ▁official ▁extensions ▁there of , ▁counting ▁only ▁primary ▁resid ences . ▁▁ ¹ ▁Census ▁data ▁ ▁Government ▁Under ▁the ▁local ▁government ▁reform ▁in ▁the ▁ 1 9 7 0 s ,