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  2. Industrial Hygienist & PPE Expert Stephen Petty, The Truth About Cloth Masks & N95s

    Industrial Hygienist & PPE Expert Stephen Petty, The Truth About Cloth Masks & N95s

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  6. Stephen Petty, Expert, Industrial Hygienist solution far more effective than masks

    Stephen Petty, Expert, Industrial Hygienist solution far more effective than masks

    12
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    956
    2
  7. Stephen Petty - On the effectiveness of masks

    Stephen Petty - On the effectiveness of masks

    74
  8. PPE Expert Stephen Petty, The Truth About Cloth Masks & N95s (Includes Presentation Slides)

    PPE Expert Stephen Petty, The Truth About Cloth Masks & N95s (Includes Presentation Slides)

    51
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    11.5K
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  9. Testimony: Industrial Hygienist Stephen Petty

    Testimony: Industrial Hygienist Stephen Petty

    140
  10. Stephen Petty - On the effectiveness of masks

    Stephen Petty - On the effectiveness of masks

    24
  11. Effectiveness of "Masks" by Stephen Petty - Council Meeting

    Effectiveness of "Masks" by Stephen Petty - Council Meeting

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    1.83K
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  12. Stephen Petty on the Effectiveness of Masks

    Stephen Petty on the Effectiveness of Masks

    17
  14. Stephen Petty-Engineering Expert on Masking

    Stephen Petty-Engineering Expert on Masking

    71
  17. Stephen Petty - On the effectiveness of Masks

    Stephen Petty - On the effectiveness of Masks

    94
  18. Stephen Petty - On the effectiveness of masks.

    Stephen Petty - On the effectiveness of masks.

    60
  20. How Much Protection Can a Mask Provide? Mask vs. PPE - Ep. 05 (Removed from YT)

    How Much Protection Can a Mask Provide? Mask vs. PPE - Ep. 05 (Removed from YT)

    251
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    19.4K
    45
  24. Children & Masks; CDC Document Review (1 of 4) - Ep. 11

    Children & Masks; CDC Document Review (1 of 4) - Ep. 11

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    12.1K
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