▁st ap le ▁length . ▁In ▁ 1 9 1 6 , ▁the ▁first ▁st ap le ▁fil ament ▁spin ning ▁machine ▁was ▁put ▁into ▁operation . ▁It ▁was ▁developed ▁by ▁Emil ▁Bron n ert , ▁a ▁chem ist ▁and ▁Edu ard ▁Bo os , ▁an ▁engineer . ▁ ▁This ▁positive ▁development ▁did ▁not ▁last ▁long . ▁The ▁Great ▁De pression ▁hit ▁the ▁Gl anz stoff ▁particularly ▁hard . ▁Dec lin ing ▁demand ▁led ▁to ▁extensive ▁dismiss als . ▁ ▁At ▁the ▁peak ▁of ▁the ▁crisis ▁in ▁ 1 9 3 2 , ▁the ▁company ▁had ▁a ▁work force ▁of ▁ 2 , 2 0 0 ▁employees ▁compared ▁to ▁ 6 , 3 0 0 ▁in ▁ 1 9 2 5 . ▁ ▁The ▁only ▁innov ation ▁was ▁the ▁introduction ▁of ▁per for ated ▁al umin ium ▁roll ers ▁en abling ▁the ▁production ▁of ▁even ▁bigger ▁we aves . ▁This ▁was ▁the ▁last ▁expansion ▁for ▁many ▁years . ▁The ▁strateg ic ▁economic ▁planning ▁of ▁the ▁National ▁Social ist ▁Government ▁prohib ited ▁invest ments ▁and ▁company ▁exp ans ions ▁in ▁border line ▁regions . ▁ ▁The ▁Ober bru ch ▁plant ▁became ▁a ▁research ▁and ▁development ▁facility ▁for ▁the ▁Gl anz stoff ▁Group . ▁In ▁ 1 9 3 5 , ▁the ▁first ▁tests ▁for ▁the ▁production ▁of ▁ray on ▁for ▁ty res ▁and ▁driving ▁bel ts ▁were ▁performed . ▁A ▁pilot ▁plant ▁for ▁continuous ▁spin ning , ▁was hing ▁and ▁dry ing ▁of ▁vis c ose ▁sil k ▁began ▁in ▁ 1 9 3