built-up from water tubes of form other than straight or substantially straight

Full Title

Water-tube boilers of vertical or steeply-inclined type, i.e. the water-tube sets being arranged vertically or substantially vertically > built-up from water tubes of form other than straight or substantially straight

Child Classifications

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• F22B 21/24 bent in serpentine or sinuous form
• F22B 21/26 bent helically, i.e. coiled
• F22B 21/28 bent spirally
• F22B 21/30 bent in U-loop form