Roof vent

Details Roof vent Roof vent

1982-09-27

1985-01-01

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Patent

active

D02770270

REFERENCES:
patent: D155345 (1949-09-01), Johnson
patent: D216795 (1970-03-01), Field
patent: D240827 (1976-08-01), Hill et al.
patent: 2826136 (1958-03-01), Smith
patent: 2878743 (1959-03-01), Trunnell
patent: 3093059 (1963-06-01), Metz
patent: 3094915 (1963-06-01), Leigh
patent: 4193339 (1980-03-01), Giles
patent: 4297818 (1981-11-01), Anderson

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