▁and ▁men ▁at ▁S iem ens ▁from ▁ 1 9 4 0 ▁to ▁ 1 9 4 5 , ▁in : ▁International ▁Scient ific ▁Cor respond ence , ▁No . ▁ 1 / 1 9 9 1 , ▁pp .   1 2 – 2 4 ; ▁Karl - He in z ▁Roth : ▁forced ▁labor ▁in ▁the ▁S iem ens ▁Group ▁( 1 9 3 8 ▁- 1 9 4 5 ). ▁Fact s , ▁controvers ies , ▁problems , ▁in : ▁Hermann ▁Ka ien burg ▁( ed .): ▁concentration ▁cam ps ▁and ▁the ▁German ▁Econom y ▁ 1 9 3 9 – 1 9 4 5 ▁( So cial ▁studies , ▁H . ▁ 3 4 ), ▁O pl aden ▁ 1 9 9 6 , ▁pp .   1 4 9 – 1 6 8 ; ▁Wil fried ▁Fel den kir chen : ▁ 1 9 1 8 – 1 9 4 5 ▁S iem ens , ▁Mun ich ▁ 1 9 9 5 , ▁Ul rike ▁fire , ▁Cla us ▁F üll berg - St ol berg , ▁Syl via ▁K em pe : ▁work ▁at ▁Rav ens br ück ▁concentration ▁camp , ▁in : ▁Women ▁in ▁concentration ▁cam ps . ▁Ber gen - B elsen . ▁Rav ens br ück , ▁Bre men , ▁ 1 9 9 4 , ▁pp .   5 5 – 6 9 ; ▁Urs ula ▁Kra use - Sch mitt : ▁The ▁path ▁to ▁the ▁S iem ens ▁stock ▁led ▁past ▁the