▁married ▁Dr . ▁Charles ▁Howard ▁Long ster th , ▁whom ▁Be vis ▁brought ▁into ▁both ▁the ▁Ly ons ▁and ▁Be vis ▁salt ▁companies ▁as ▁an ▁executive . ▁Their ▁son , ▁Be vis ▁Long stre th , ▁became ▁president ▁and ▁general ▁manager ▁on ▁his ▁return ▁from ▁service ▁in ▁World ▁War ▁I . ▁In ▁ 1 9 1 9 , ▁Mort on ▁Salt ▁acquired ▁Be vis . ▁About ▁ten ▁years ▁later , ▁Be vis ▁Long stre th ▁founded ▁Th i ok ol ▁Corporation , ▁which ▁merged ▁with ▁Mort on ▁Salt ▁in ▁ 1 9 8 2 ▁to ▁form ▁Mort on - Th i ok ol . ▁This ▁mer ger ▁was ▁div ested ▁in ▁ 1 9 8 9 , ▁following ▁the ▁ 1 9 8 6 ▁Space ▁Sh utt le ▁Ch allen ger ▁dis aster , ▁which ▁was ▁bl amed ▁on ▁Mort on - Th i ok ol ▁products . ▁Mort on ▁received ▁the ▁company ' s ▁consumer ▁chemical ▁products ▁divisions , ▁while ▁Th i ok ol ▁retained ▁only ▁the ▁space ▁prop ulsion ▁systems ▁concern . ▁ ▁In ▁ 1 9 9 9 , ▁Mort on ▁Salt ▁was ▁acquired ▁by ▁the ▁Philadelphia - based ▁R oh m ▁and ▁Ha as ▁Company , ▁Inc . ▁and ▁operated ▁as ▁a ▁division ▁of ▁that ▁company ▁along ▁with ▁the ▁Canadian ▁Salt ▁Company ▁( which ▁Mort on ▁had ▁acquired ▁in ▁ 1 9 5 4 ). ▁ ▁On ▁April ▁ 2 , ▁ 2 0 0 9 , ▁it ▁was ▁reported ▁that ▁Mort on ▁Salt ▁was ▁being ▁acquired ▁by ▁German