Description: 126 / (93) Open Combustion Chamber (94) Fireplace Type (98) Combustion Air And Flue Gas Circulation (99) Dampers

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126 / 93

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-> 98

-> 99

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This will show what classes derive from the input. Ex: entering 78/35 shows the derived classes and the search that can be used to find patents in those subclasses.

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