US Occupational Safety and Health Administration e amohetse melao e mecha e etselitsoeng ho sireletsa basebetsi hore ba se ke ba kopana le silika e phefumolohang (e phefumolohang) ea kristale, joalo ka lerōle la konkreite e sililoeng ka daemane.Melao ena e na le bonnete ba molao le katleho.E sebetsa ka la 23 Loetse 2017.
Molao ona o hloka hore u sebelise maemo a khethehileng a phallo ea moea le ho sefa ha u sebelisa grinder ea fatše e nang le li-vacuum cleaners tsa indasteri.'Me li-vacuum cleaners tsa rona tsa TS li kopana le molao ona le litekanyetso, tse nang le moralo o motle le mohaho o matla, o fanang ka tiiso e ntle bakeng sa mosebetsi oa basebetsi.
Nako ea poso: Jun-04-2018