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PCE
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CPC Subgroup
F22D 5/06

with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level

Full Title

Controlling water feed or water level; Automatic water feeding or water-level regulators > with receptacles external to, but in free communication with, the boilers and adapted to move up and down in accordance with change in water level