| 摘要 |
553,782. Hot-water boilers. SIGERIST, R. Oct. 13, 1942, No. 14356. Convention date, Oct. 14, 1941. [Class 64 (i)] A tubular element 1 extending across the flue of the boiler of a water heating-system is connected by flexible pipes 8 to the flow and return pipes 10, 9 of the system and has a tubular extension 5 projecting at right angles into the fire space of the boiler.
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