Filter to be attached around user's waist for purifying air in a

Details Filter to be attached around user's waist for purifying air in a Filter to be attached around user's waist for purifying air in a

1990-10-29

1992-10-27

Burke, Wallace R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Air treatment

D24117

Patent

active

D03305872

REFERENCES:
patent: D212064 (1968-08-01), Campbell et al.
patent: 1176711 (1916-03-01), Gibbs
patent: 2400180 (1946-05-01), Venable
patent: 4403587 (1983-09-01), Mizuno et al.
patent: 4446869 (1984-05-01), Fnodle
patent: 4506667 (1985-03-01), Ansite
patent: 5038768 (1991-08-01), McGoff et al.

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