Diskuto:Rulŝtuparo
El Vikipedio
[redaktu] Aldonaj bildoj
[redaktu] Aldonaj eksteraj ligiloj
http://www.washingtonpost.com/wp-srv/local/facts/metro120598.htm
http://www.chinaelevator.org
http://www.elevator.org.tw
http://otis.com
http://www.mitsubishi-elevator.com/design/spiral/spiral.htm
http://www.otis.com/products/listing/0,1357,CLI1_PRT44,00.html
http://www.schindler.co.il/TLV/webtlvis.nsf/pages/esca-01
http://patimg1.uspto.gov/.piw?Docid=00470918&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO2%2526Sect2%3DHITOFF%2526u%3D%2Fnetahtml%2Fsearch-adv.htm%2526r%3D145%2526f%3DG%2526l%3D50%2526d%3DPALL%2526s1%3D(198%2F321.CIOR.%252Bor%252B198%2F321.CIXR.%252Bor%252B198%2F321.CIŬ,CIDX.
http://www.n-elekyo.or.jp/comf/esc_use_01.html