Patent classifications
F
MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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F27
FURNACES; KILNS; OVENS; RETORTS
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F27D
DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
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99/00
Subject matter not provided for in other groups of this subclass
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F27D99/0001
Heating elements or systems
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F27D99/0006
Electric heating elements or system
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F27D2099/0028
Microwave heating
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