Description: 122 / (36) Boilers And Water Heaters (47) Water Tube Boilers (63) Drumless Type (64) Once Through (65) Methods of Operation (66) Start Up or Shut Down

Hierarchy/Derived subclasses

122 / 36

-> 47

-> 63

-> 64

-> 65

-> 66

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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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