Deprecated: The each() function is deprecated. This message will be suppressed on further calls in /home/zhenxiangba/zhenxiangba.com/public_html/phproxy-improved-master/index.php on line 456 DE1323656U - - Google Patents
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Early Detection of Health Impairment in Occupational Exposure to Health Hazards, in: Report of a WHO Study Group. Technical Report Series No. 571, World Health Organization, Geneva (1975), p. 80