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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H05B3/10
Heating elements characterised by the composition or nature of the materials or by the arrangement of the conductor
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H05B3/18
the conductor being embedded in an insulating material
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