https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fullf.web&search1=R=301803
Energy, Mines and Resources Canada, 1975
Operators of the German Standard Intrinsic Safety Test Apparatus (VDE 0170/0171, 1963) in the United States and in the United Kingdom, have expressed concern...
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