IEC: 61779-4, Ed.1-1998; Electrical apparatus for the detection and measurement of flammable gases- Part 4: Performance requirements for group II apparatus indicating a volume fraction up to 100% lower explosive limit.

I.E.C.

IEC: 61779-4, Ed.1-1998; Electrical apparatus for the detection and measurement of flammable gases- Part 4: Performance requirements for group II apparatus indicating a volume fraction up to 100% lower explosive limit. - 1st - Geneva IEC 1998 - 7

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