USRE39493E1
(en)
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Respirator having snap-fit filter cartridge
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US4233972A
(en)
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Portable air filtering and breathing assist device
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US3736927A
(en)
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Self-contained air purifier and conditioner unit
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(en)
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Ventilated welder{3 s mask assembly
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US3413972A
(en)
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Airflow helmet
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GB2032284B
(en)
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Breathing apparatus
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US10653197B2
(en)
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Hard hat with filtered, battery-operated air flow system and method
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AU4275385A
(en)
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Respirators fan-assisted
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KR200471463Y1
(en)
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Apparatus for breathing air
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FR785223A
(en)
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Portable gas protection device
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EP0108560A1
(en)
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Powered air supply units for respirators
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GB761263A
(en)
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|
Improvements in respiratory masks
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FR782137A
(en)
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Improvements to gas masks
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GB1212821A
(en)
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Improvements in or relating to respirator devices
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(en)
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Autonomous aerator for breathing in polluted atmosphere
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FR818839A
(en)
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Respiratory System Improvements
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AT115845B
(en)
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Filters, in particular breathing filters for smoke and mist, and processes for their manufacture.
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DE1979478U
(en)
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FOR ATTACHMENT TO AGRICULTURAL MACHINERY, IN PARTICULAR COMBINE, SUITABLE AIR PURIFICATION DEVICE.
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GB2029258A
(en)
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Improvements in or relating to bulk material vacuum conveying apparatus
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DD749A
(en)
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