arising out of coal mine employmentincludes any chronic pulmonary disease or respiratory or pulmonary impairment significantly related to, or substantially aggravated by, dust exposure in coal mine employment.
Legal pneumoconiosisincludes any chronic lung disease or impairment and its sequelae arising out of coal mine employment.
pneumoconiosismeans a chronic dust disease of the lung and its sequelae, including respiratory and pulmonary impairments, arising out of coal mine employment.