TY JOUR TI SEARCH AND THE GENERALIZED INDICES OF PATENT DOCUMENTSIN THE SPHERE OF RESCUE SERVICES AND FIRE-PREVENTION MEANS IN THE WORLD (1997-2016) KW emergency situations KW fire KW innovation KW invention KW International Patent Classification KW database KW Federal Service for Intellectual Property (Rospatent) KW European Patent Office JO Scientific and analytical journal «Vestnik Saint-Petersburg university of State fire service of EMERCOM of Russia» AU Evdokimov, V.I. AU Shevtsov, V.I. AU Potashev, D.A. PY 2017 IS 2017 PB Saint-Petersburg University of State Fire Service of Emercom of Russia