TY JOUR TI TOWER LADDERS: HISTORICAL ASPECTS, TECHNICAL SPECIFICATIONS, DESIGN SOLUTIONS KW fire car lift KW jib KW cradle KW specifications KW design KW height KW offset JO Problems of risk management in the technosphere AU Presnov, A.I. AU Pechurin, A.A. AU Danilevich, A.V. PY 2018 IS 2018 PB Saint-Petersburg University of State Fire Service of Emercom of Russia