"STEEL,ELEVATED WALKWAY FOR CONTROLING DRYDOCK OPERATIONS,ASSEMBLEDFROM THE FOLLOWING,2 EA CATWALK BEAMS /LONG/ MARK NO. DS-4,4 EA BEAMBRACKETS MARK NO. DS-16,4 EA PANELS MARK NO. DS-3,24 EA HOOK BOLTS MARKNO. DS 18,USED FOR P-SERIES PONTOONS,NAVFAC DWG 816468,MARK NO. DS-7"