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.:Acoustics. Determination of sound power levels of noise sources using sound intensity. Measurement at discrete points. Engineering method
:01.04.1998
: , , , , ,
:0 --2009-06-01 (. --2009-06-01)
1: 30457-97
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    30457-97

    : 30457-97
    :01.06.2009
    :01.08.2009


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