▁of ▁mill st ones ▁via ▁lan tern ▁pin ion ▁stone ▁n uts . ▁ ▁which ▁have ▁ 3 2 ▁st aves ▁each , ▁apart ▁from ▁that ▁driving ▁the ▁p ear l ▁bar ley ▁stones , ▁which ▁has ▁ 2 4 ▁st aves . ▁Three ▁pairs ▁are ▁ ▁diameter ▁C ull en ▁mill st ones , ▁and ▁one ▁pair ▁are ▁ ▁C ull ens . ▁ ▁Public ▁access ▁Het ▁Fort u yn ▁is ▁open ▁during ▁museum ▁opening ▁hours . ▁ ▁See ▁also ▁Wind m ills ▁in ▁Arn hem ▁De ▁Ho op ▁De ▁K ro on ▁ ▁Wind m ills ▁in ▁the ▁Netherlands ▁Open ▁Air ▁Museum ▁B ok t jas j ker ▁Hu iz erm olen ▁M ijn ▁Gen o egen ▁Sp inn enk op ▁Arn hem ▁post ▁mill ▁( 1 9 4 6 ) ▁Arn hem ▁post ▁mill ▁( 1 9 8 9 ) ▁Arn hem ▁sm ock ▁mill ▁( 1 9 6 0 ) ▁ ▁References ▁ ▁External ▁links ▁ ▁Open l ucht museum ▁webpage ▁about ▁the ▁mill ▁▁ ▁Category : W ind m ills ▁in ▁Gel der land ▁Category : W ind m ills ▁completed ▁in ▁ 1 9 2 0 ▁Category : T ower ▁mill s ▁in ▁the ▁Netherlands ▁Category : Gr inding ▁mill s ▁in ▁the ▁Netherlands ▁Category : A gr icult ural ▁buildings ▁in ▁the ▁Netherlands <0x0A> </s> ▁Iron ▁Crow ▁v . ▁O gl ala ▁Si oux ▁Tri be ▁of ▁P ine ▁R idge ▁Res ervation , ▁ 2 3 1 ▁F . 2 d ▁ 8 9 ▁(