| 摘要 |
544,563. Vertical boilers. CLARKSON THIMBLE TUBE BOILER CO., Ltd., and FOUNTAIN, H. J. Dec. 24, 1940, No. 18089. [Class 123 (ii)] The firebox of a vertical boiler is provided with superposed rows of cross water tubes. E and with closed-ended water tubes F projecting into the semicircular or sector shaped spaces at the sides of the cross tubes.
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