US PATENT SUBCLASS 237 / 53
.~ Furnace

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

Internet Version by PATENTEC © 1999      Terms of Use


237 /   HD   HEATING SYSTEMS

50  DF  AIR {4}
53.~ Furnace

DEFINITION

Classification: 237/53

(under subclass 50) Air heating-systems having a hot-air furnace as the source of heat.

SEE OR SEARCH THIS CLASS, SUBCLASS:

48, for ventilating heating systems using a furnace.