Where does this definition of return tube boiler come from?
This entry for return tube boiler is sourced from GetWord Corpus, one of the dictionaries and corpora merged into Lughet.
Does return tube boiler appear elsewhere on Lughet?
Yes — return tube boiler appears under other sources or language pairs in Lughet's collection. See the list below.
What is Lughet?
Lughet is a free trilingual dictionary covering nearly five million entries across Uyghur, Chinese, and English, drawn from more than ten source dictionaries and corpora.