exact
DRAFT-MINDER
exact
DRAFT-MINDER
Trademarks matching 'draft-minder'
Summary of page content
1948-04-22
557132
1952-04-08
US
-
11
Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes.
an automatic draft regulator of the type comprising a blade pivoted in, and substantially filling an opening and provided with a counter-balancing weight which can be adjusted to and from the axis of rotation of the blade to vary the air pressure required to tilt the blade and admit air through the opening
2020-05-31
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