, ▁a ▁pair ▁of ▁mill st ones ▁for ▁the ▁production ▁of ▁p ear l ▁bar ley ▁was ▁added . ▁In ▁the ▁late ▁ 1 9 th ▁century ▁the ▁mill ▁was ▁owned ▁by ▁the ▁Ros sum ▁family , ▁and ▁was ▁also ▁known ▁as ▁the ▁Mol en ▁van ▁Ros sum . ▁In ▁the ▁early ▁ 2 0 th ▁century , ▁the ▁Fr ans - Hol land se ▁Ol ief ab rie ken ▁Cal vé ▁and ▁the ▁Nederland sche ▁G ist - ▁en ▁Spirit us fab rie k ▁purchased ▁the ▁mill ▁as ▁they ▁were ▁expand ing ▁their ▁oil ▁mill s . ▁The ▁mill ▁was ▁dis m ant led ▁in ▁ 1 9 1 7 . ▁It ▁was ▁re - ere cted ▁at ▁the ▁Netherlands ▁Open ▁Air ▁Museum , ▁Arn hem ▁in ▁ 1 9 2 0 . ▁The ▁mill ' s ▁wind sh aft ▁was ▁broken ▁during ▁the ▁dis m ant ling ▁of ▁the ▁mill . ▁A ▁new ▁one ▁was ▁proc ured ▁for ▁use ▁in ▁the ▁re - ere cted ▁mill . ▁The ▁costs ▁of ▁demol ishing ▁and ▁re - ere ct ing ▁the ▁mill ▁were ▁shared ▁between ▁the ▁oil ▁mill s ▁and ▁the ▁Geme ente ▁Arn hem . ▁ ▁The ▁mill ▁was ▁not ▁restored ▁to ▁working ▁order ▁and ▁its ▁condition ▁d eter ior ated ▁over ▁time . ▁In ▁ 1 9 7 5 , ▁it ▁was ▁restored ▁so ▁that ▁it ▁could ▁turn ▁in ▁the ▁wind . ▁A ▁pair ▁of ▁mill st ones ▁were ▁restored ▁to ▁working ▁order ▁at ▁a ▁later ▁date . ▁In ▁ 1