US PATENT SUBCLASS 454 / 31
.~.~.~.~ Plural

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
27  DF  .~.~ Having readily movable air current regulating means {3}
30  DF  .~.~.~ Pivoted {1}
31.~.~.~.~ Plural

DEFINITION

Classification: 454/31

Plural:

(under subclass 30) Subject matter having two such shiftable means which rotate about the same or different fixed axes.

SEE OR SEARCH THIS CLASS, SUBCLASS:

6, for plural pivoted chimney or stacktop closures.

351, and 352, for plural damper panels in an outlet airway.