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  1. CDC workers sick after train crash investigation || Stephen Petty

    CDC workers sick after train crash investigation || Stephen Petty

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    8.72K
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  4. Stephen Petty, Expert, Industrial Hygienist solution far more effective than masks

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

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  5. How can anyone say it’s safe? Interview with industrial hygienist, Stephen E. Petty, on the testing of the water and air in East Palestine, Ohio

    How can anyone say it’s safe? Interview with industrial hygienist, Stephen E. Petty, on the testing of the water and air in East Palestine, Ohio

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    1.93K
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  7. 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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    1.61K
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  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)

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    11.5K
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  12. Stephen Petty - On the effectiveness of Masks

    Stephen Petty - On the effectiveness of Masks

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  13. Stephen Petty-Engineering Expert on Masking

    Stephen Petty-Engineering Expert on Masking

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  14. Testimony: Industrial Hygienist Stephen Petty

    Testimony: Industrial Hygienist Stephen Petty

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  15. Covid Revealed – Episode 8B - Bonus Video (Stephen Petty)

    Covid Revealed – Episode 8B - Bonus Video (Stephen Petty)

    27
  18. STEPHEN PETTY ON PPE AND AEROSOLS

    STEPHEN PETTY ON PPE AND AEROSOLS

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  19. Stephen Petty - On the effectiveness of masks

    Stephen Petty - On the effectiveness of masks

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  20. Covid Revealed Episode 8 Bonus - Stephen Petty

    Covid Revealed Episode 8 Bonus - Stephen Petty

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  21. Stephen Petty - On the effectiveness of masks

    Stephen Petty - On the effectiveness of masks

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  23. Stephen Petty on the Effectiveness of Masks

    Stephen Petty on the Effectiveness of Masks

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