Back draft shutter

Details Back draft shutter Back draft shutter

1983-07-01

1986-11-04

Kemper, Catherine E.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

Patent

active

D02865637

REFERENCES:
patent: D128109 (1941-07-01), De Roo et al.
patent: 1550813 (1925-08-01), Johnson
patent: 1996340 (1935-04-01), Mader
patent: 2355412 (1944-08-01), Bird
patent: 3204548 (1965-09-01), McCabe
patent: 3281113 (1966-10-01), Ahern
patent: 3908529 (1975-09-01), McCabe
patent: 4241647 (1980-12-01), Herr

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