Roof vent

Details Roof vent Roof vent

1979-04-23

1981-05-12

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2304

Patent

active

D02592088

REFERENCES:
patent: 163961 (1875-10-01), Betts
patent: D190144 (1961-04-01), Breidert
patent: D193642 (1962-09-01), Patterson
patent: 1785228 (1930-12-01), Schmidt
patent: 2830526 (1958-04-01), Breidert
patent: 3049068 (1962-08-01), Rousey

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