Air filter, or similar article

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1975-05-07

1977-05-31

Burke, Wallace R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2304

Patent

active

D02445387

REFERENCES:
patent: D177925 (1956-06-01), Powers et al.
patent: 2677436 (1954-05-01), Mazek
patent: 2715453 (1955-08-01), Lange
patent: 3774377 (1973-11-01), Bishop
patent: 3831765 (1974-08-01), Flynn et al.

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