US1778811A
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Electric heating apparatus and resistance units therefor
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DE591627C
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Electric tubular heater
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GB327499A
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Improvements in or relating to means for electrically connecting together electric heaters
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GB326889A
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Improvements in or relating to resistance units and electric heating apparatus comprising the same
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GB327304A
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Improvements in or relating to electric heating apparatus and resistance units therefor
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GB327392A
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Improvements in or relating to resistance units and electric heating apparatus comprising the same
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GB314570A
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Improvements in or relating to electric junction boxes and electric heating apparatus comprising the same
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ES107040A1
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Improvements in electric heating appliances.
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US1710511A
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Electric heating apparatus
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GB288799A
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Improvements in or relating to electric heating apparatus
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