Patent classifications
H
ELECTRICITY
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H05
ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
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H05B
ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
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H05B3/40
Heating elements having the shape of rods or tubes
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H05B3/44
heating conductor arranged within rods or tubes of insulating material
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