A Microscope eyepiece graticule for the evaluation of fibrous dusts
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<subfield code="a">A microscope eyepiece graticule has been designed specifically to help in the counting of respirable fibrous dust. This is now in use in a number of laboratories and has been found to have several advantages over conventional designs, in particular when determining the length and diameter of fibres</subfield>
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<subfield code="t">The Annals of occupational hygiene</subfield>
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