A Multishift gravimetric dust sampling instrument

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      <subfield code="a">A respirable dust sampling instrument, which can collect dust over a number of working shifts to a pre-programmed pattern, is described. The instrument can operate unattended underground with placing and retrieval being carried out at convenient times. The new instrument is similar in general construction to the MRE 113A instrument. The multishift sampler gives results in good agreement with those from the MRE sampler and extended operational trials have indicate that it could with advantage be used as a replacement for the latter instrument</subfield>
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