ca,abheritage)/abinvents/inventions/inv_hw_ladder_beam.htm 20101208170005 http://www.abheritage.ca/abinvents/inventions/inv_hw_ladder_beam.htm text/html 200 TTXSLYPAHXRJO2Q4A2N64ACHM7AARRE7 - - 0 74609208 ARCHIVEIT-2217-NONE-JFTQDS-20101208163722-00002-crawling105.us.archive.org-6682.warc.gz