▁solar ▁phot ov olta ic ▁business , ▁including ▁ 3 ▁solar ▁module ▁manufact uring ▁plants , ▁from ▁industry ▁pione er ▁AR CO ▁Sol ar , ▁owned ▁by ▁oil ▁firm ▁AR CO . ▁ ▁In ▁ 1 9 9 1 , ▁S iem ens ▁acquired ▁N ix dorf ▁Computer ▁AG ▁and ▁renamed ▁it ▁S iem ens ▁N ix dorf ▁Inform ations system e ▁AG , ▁in ▁order ▁to ▁produce ▁personal ▁computers . ▁ ▁In ▁October ▁ 1 9 9 1 , ▁S iem ens ▁acquired ▁the ▁Indust rial ▁Systems ▁Division ▁of ▁Texas ▁Inst ru ments , ▁Inc , ▁based ▁in ▁Johnson ▁City , ▁Tennessee . ▁This ▁division ▁was ▁organized ▁as ▁S iem ens ▁Indust rial ▁Autom ation , ▁Inc ., ▁and ▁was ▁later ▁absor bed ▁by ▁S iem ens ▁Energy ▁and ▁Autom ation , ▁Inc . ▁ ▁In ▁ 1 9 9 2 , ▁S iem ens ▁bought ▁out ▁IBM ' s ▁half ▁of ▁R OL M ▁( S iem ens ▁had ▁bought ▁into ▁R OL M ▁five ▁years ▁earlier ), ▁thus ▁creating ▁S iem ens RO LM ▁Communic ations ; ▁eventually ▁dro pping ▁R OL M ▁from ▁the ▁name ▁later ▁in ▁the ▁ 1 9 9 0 s . ▁ ▁In ▁ 1 9 9 3 – 1 9 9 4 , ▁S iem ens ▁C 6 5 1 ▁electric ▁trains ▁for ▁Singapore ' s ▁Mass ▁Rap id ▁Trans it ▁( M RT ) ▁system ▁were ▁built ▁in ▁Austria . ▁ ▁In ▁ 1 9 9 7 , ▁S iem ens ▁agreed ▁to