Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
F22B23/00—Water-tube boilers built-up from sets of spaced double-walled water tubes of return type in unilateral abutting connection with a boiler drum or with a header box, i.e. built-up from Field water tubes comprising an inner tube arranged within an outer unilaterally-closed tube
Schmiedeeiserner Gliederkessel, dessen Querglieder aus zu beiden Seiten des Fuellschachts in derselben Ebene liegenden, untereinander verbundenen Roehren bestehen