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MF-11/FMJ05 + Exhale valve and voice diaphragm assembly from Type 64B + Voice diaphragm cover from Type 64B + 6 point head harness from MC-1 = A more comfortable mask : r/gasmasks
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New Airflow Videos Show Why Masks With Exhalation Valves Do Not Slow the Spread of COVID-19 | NIST
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T.33 | Gas Mask and Respirator Wiki | Fandom
Parcil Safety Full Face Organic Vapor Tactical Gas Mask and Survival Respirator with 40mm P-D-1 Filter Pod ST-100X
Evaluation of Exhalation Resistance and Inspired Carbon Dioxide Concentration in Elastomeric Half-Mask Respirators with Modified or Covered Exhalation Valves (2022-109) | NIOSH | CDC
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Identifying Variations of the C15 Exhalation Valve. The C15 is history's most successful gas mask outlet valve design, appearing in experimental phases during late WWII and being standardized on the M9 Field
