GB1121403A
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Improved unit for controlling ingress into and heating of water in a pressure vessel
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GB1115798A
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Improvements in and relating to water heating apparatus
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GB1111526A
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Improvements in and relating to water heating apparatus
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US2894109A
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Commercial water heater
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GB871333A
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Improvements in water heating and hot water supplying apparatus
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GB863857A
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Improved water heating and hot water supplying apparatus
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GB863856A
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Improvements in water heating and hot water supplying apparatus
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US2852656A
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Household water heating apparatus
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CA611391A
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Household water heating apparatus
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CA577408A
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Water heating apparatus, and an improved pressure actuable valve therefor
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CA593935A
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Commercial water heater
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