Air duct

Details Air duct Air duct

1991-06-21

1992-07-28

Burke, Wallace R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Patent

active

D03283453

REFERENCES:
patent: D300777 (1989-04-01), Bales et al.
patent: 3120166 (1964-02-01), Lyman
patent: 3359883 (1967-12-01), Murphy
patent: 3608280 (1971-09-01), Martin
patent: 4020753 (1977-05-01), Efstratis
patent: 4700550 (1987-10-01), Rhodes
patent: 4860548 (1989-08-01), Ryham
patent: 4864830 (1989-09-01), Ryham

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