▁iron ▁frame ▁of ▁the ▁Stat ue ▁of ▁Liber ty . ▁ ▁The ▁E iff el ▁firm ▁had ▁advance ▁knowledge ▁of ▁the ▁project ▁and , ▁beginning ▁in ▁ 1 8 8 4 , ▁ ▁had ▁already ▁designed ▁a ▁tower ▁exactly ▁to ▁those ▁dimensions . ▁ ▁The ▁struct ural ▁design ▁was ▁created ▁by ▁two ▁E iff el ▁engine ers , ▁Maurice ▁Ko ech lin ▁and ▁É mile ▁N oug u ier , ▁who ▁along ▁with ▁E iff el ▁himself , ▁received ▁the ▁pat ent ▁for ▁the ▁plan . ▁An ▁E iff el ▁architect , ▁Stephen ▁Sau vest re , ▁designed ▁the ▁cur ving ▁form ▁and ▁decor ation ▁which ▁gave ▁the ▁tower ▁its ▁distinct ive ▁appearance . ▁ ▁E iff el ▁was ▁granted ▁exclusive ▁rights ▁for ▁twenty ▁years ▁to ▁operate ▁the ▁tower ▁and ▁its ▁restaur ants ▁and ▁view ing ▁platforms . ▁ ▁A ▁site ▁next ▁to ▁the ▁River ▁was ▁chosen , ▁despite ▁the ▁in fil tr ation ▁of ▁river ▁water , ▁since ▁that ▁land ▁was ▁owned ▁by ▁the ▁City ▁of ▁Paris , ▁and ▁the ▁tower ▁could ▁be ▁kept ▁in ▁place ▁after ▁the ▁Ex position ▁was ▁completed . ▁▁ ▁The ▁construction ▁last ed ▁two ▁years , ▁two ▁months ▁and ▁five ▁days , ▁and ▁involved ▁five ▁hundred ▁workers , ▁who ▁assemble d ▁eigh teen ▁thousand ▁iron ▁pieces , ▁each ▁of ▁five ▁meters ▁and ▁carefully ▁number ed , ▁which ▁had ▁been ▁made ▁at ▁a ▁factory ▁in ▁Le val lo is - Per ret , ▁a ▁Paris ▁sub urb . ▁Spe aking ▁of ▁the ▁tower ▁construction ▁workers , ▁the ▁son