GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS (detecting or locating foreign bodies for diagnostic, surgical or person-identification purposes Fulltext... Hierarchy... Expanded...A61B; means for indicating the location of accidentally buried, e.g. snow-buried, persons Fulltext... Hierarchy... Expanded...A63B 29/02; measuring chemical or physical properties of earth materials Fulltext... Hierarchy... Expanded...G01N; measuring electric or magnetic variables in general, other than direction or magnitude of the earth's field Fulltext... Hierarchy... Expanded...G01R; radar, sonar or analogous methods Fulltext... Hierarchy... Expanded...G01S 13/00, Fulltext... Hierarchy... Expanded...G01S 15/00, Fulltext... Hierarchy... Expanded...G01S 17/00) |