title: [Contact ultrasound and its hygienic importance as a factor of the industrial environment].
mesh_terms: D000041:Absenteeism; D006801:Humans; D008452:Maximum Allowable Concentration; D009784:Occupational Diseases / Q000453:epidemiology / Q000209:etiology; D014586:USSR; D014465:Ultrasonics / Q000009:adverse effects* / Q000295:instrumentation; D014732:Vibration / Q000009:adverse effects*
vernacular_title: Kontaktnyĭ ul'trazvuk i ego gigienicheskaia znachimost' kak faktora proizvodstvennoĭ sredy.