US PATENT SUBCLASS 110 / 182.5
Current as of: June, 1999
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(under the class definition) Subject matter relating to conduits for feeding air to furnaces.
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297+, for feeding of air to a firebox.
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122, Liquid Heaters and Vaporizers,
6.6+, for tuyeres in boilers.
266, Metallurgical Apparatus, 186+, 218+, and 265+ for tuyeres used in a metallurgical furnace.