Where does Occupational Safety originally come from? How/where in the world or human history did it start?

Must have references!

Thank you

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=137881&dopt=Abstract

(Broken Link Removed)

http://www.bookrags.com/research/occupational-safety-and-health-act-sjel-02/

http://www.google.com/search?as_q=history+&hl=en&num=10&btnG=Google+Search&as_epq=Occupational+Safety&as_oq=&as_eq=&lr=&as_ft=i&as_filetype=&as_qdr=all&as_nlo=&as_nhi=&as_occt=title&as_dt=i&as_sitesearch=&as_rights=&safe=images