ly ▁listed ▁company ▁C FE ▁as ▁its ▁share hold ers . ▁However , ▁S G D ▁had ▁older ▁roots ▁d ating ▁back ▁to ▁the ▁construction ▁of ▁the ▁port ▁of ▁Ze ebru g ge ▁( in aug ur ated ▁in ▁ 1 9 0 7 ). ▁ ▁In ▁the ▁ 1 9 7 0 s ▁a ▁major ▁cons olid ation ▁movement ▁happened ▁in ▁the ▁d red ging ▁industry ▁in ▁Europe . ▁In ▁ 2 5 ▁years , ▁the ▁number ▁of ▁European ▁d red ging ▁companies ▁dropped ▁from ▁four teen ▁in ▁ 1 9 7 0 ▁to ▁six ▁by ▁the ▁turn ▁of ▁the ▁century . ▁On ▁ 2 7 ▁November ▁ 1 9 7 4 ▁the ▁d red ging ▁division ▁of ▁A ck erm ans ▁& ▁van ▁H aar en ▁merged ▁with ▁Société ▁Gén éra le ▁de ▁Drag age ▁– ▁creating ▁syn erg ies ▁that ▁proved ▁to ▁be ▁much ▁welcome ▁in ▁the ▁bo oming ▁mark ets ▁of ▁the ▁Middle ▁East ▁after ▁the ▁ 1 9 7 3 ▁oil ▁shock . ▁T ogether ▁they ▁formed ▁D red ging ▁International . ▁ ▁After ▁the ▁global ▁crisis ▁in ▁the ▁d red ging ▁business ▁during ▁the ▁ 1 9 8 0 s ▁had ▁been ▁resolved , ▁D red ging ▁International ▁and ▁B agger wer ken ▁Dec lo ed t ▁& ▁Z oon ▁te amed ▁up ▁to ▁become ▁DE ME ▁on ▁ 1 0 ▁April ▁ 1 9 9 1 . ▁In ▁ 2 0 0 0 ▁the ▁De ▁Clo ed t ▁family ▁was ▁bought ▁out ▁by ▁the ▁other ▁share