Roof vent

Details Roof vent Roof vent

1978-12-11

1980-04-22

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

98 42R, D2304

Patent

active

D02548046

REFERENCES:
patent: D223712 (1972-05-01), Mason
patent: 1502944 (1924-07-01), Earhart
patent: 2277982 (1942-03-01), Hosbein
patent: 3345932 (1967-10-01), Sauer
patent: 3404619 (1968-10-01), Topp
patent: 3593478 (1971-07-01), Mason
patent: 3685426 (1972-08-01), Rosa

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