▁On ▁its ▁ 5 0 th ▁anni versary ▁in ▁ 1 9 5 4 ▁it ▁employed ▁more ▁than ▁ 2 , 0 0 0 ▁people ▁and , ▁with ▁Ernest ' s ▁sons ▁Frank ▁and ▁Jack ▁in ▁charge , ▁was ▁the ▁largest ▁exclusive ▁producer ▁of ▁AC ▁mot ors ▁in ▁the ▁world , ▁and ▁had ▁a ▁turn over ▁of ▁£ 4 , 5 0 0 , 0 0 0 . ▁That ▁same ▁year ▁Brook ▁Mot ors ▁Ltd ▁operated ▁ 1 0 ▁fact ories ▁in ▁Hud ders field , ▁its ▁biggest ▁being ▁Em press ▁Works ▁on ▁St ▁Thomas ' s ▁Road , ▁and ▁opened ▁one ▁at ▁Bar ugh ▁Green , ▁Bar ns ley . ▁Other ▁local ▁manufact ur ers ▁are ▁C umm ins ▁Tur bo ▁Techn ologies , ▁founded ▁in ▁ 1 9 5 2 ▁as ▁Hol set ▁by ▁Mess rs . ▁Hol mes ▁and ▁Cro set . ▁( t ur bo charg ers ), ▁David ▁Brown ▁G ear ▁systems ▁( indust rial ▁g ear ing ), ▁Hud ders field ▁Fine ▁Wor st eds ▁( text iles ), ▁Taylor ▁& ▁L odge ▁( text iles ), ▁C ▁& ▁J ▁Ant ich ▁( text iles ), ▁Sy ng enta ▁AG ▁( ag ro - chem ical s ), ▁P enn ine ▁Radio ▁Limited ▁( elect ron ics ▁transform ers ▁and ▁sheet ▁metal working ) ▁and ▁a ▁large ▁number ▁of ▁n iche ▁manufact ur ers , ▁such ▁as ▁D ual ▁Se al ▁G lass ▁( maker ▁of ▁sp and rel ▁glass ▁pan els ) ▁and ▁Ell is ▁F