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FR2537886A1
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Method and installation for producing filter elements, particularly respiratory masks
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FR2491780A1
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Nonwoven fabrics charged with powdered material - mixed with hackled wastes from chemically-bonded nonwovens
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WO8101019A1
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Respiratory mask and filtering material included therein
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FR2469933A1
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Face mask filter cores of thermally contracted fibre mats - enhance retention of fine particles without using very fine fibres
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FR2467010A1
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Face mask filter cores of thermally contracted fibre mats - enhance retention of fine particles without using very fine fibres
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FR2259798A1
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Dehydrating device for double glazing units - comprises a string of packets of powdered desiccant
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GB1376031A
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Respirator masks
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ZA7202640B
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Respiratory mask
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DE2165739A1
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FILTER
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US3640664A
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Shaping molds for producing filmlike articles
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GB1182838A
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Face-Mask or Respirator.
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