UL 1523-1987 UL Standard for Safety Controlled-Descent Devices for Marine Use (First Edition; Reprint with Revisions Through and Including June 22@ 1990)
1998UL 1523-1998 Controlled-descent devices for marine use
1987UL 1523-1987 UL Standard for Safety Controlled-Descent Devices for Marine Use (First Edition; Reprint with Revisions Through and Including June 22@ 1990)