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Positive pressure dog respirator
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Patent number 11,433,262
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Issue date Sep 6, 2022
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The United States of America as represented by the Secretary of the Army
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Douglas E Wilke
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A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
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Canine filtration mask
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Patent number 4,726,174
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Issue date Feb 23, 1988
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Margaret N. Wilson
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A62 - LIFE-SAVING FIRE-FIGHTING
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2312714
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Patent number 2,312,714
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Issue date Mar 2, 1943
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A62 - LIFE-SAVING FIRE-FIGHTING
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1812380
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Patent number 1,812,380
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Issue date Jun 30, 1931
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A62 - LIFE-SAVING FIRE-FIGHTING