involving more than two upper drums and a single lower drum

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Patents Grantslast 30 patents

Information Patent Grant
2126862
- Patent number 2,126,862
- Issue date Aug 16, 1938
- F22 - STEAM GENERATION
Information Patent Grant
2015338
- Patent number 2,015,338
- Issue date Sep 24, 1935
- F22 - STEAM GENERATION
Information Patent Grant
1964412
- Patent number 1,964,412
- Issue date Jun 26, 1934
- F22 - STEAM GENERATION
Information Patent Grant
1929891
- Patent number 1,929,891
- Issue date Oct 10, 1933
- F22 - STEAM GENERATION
Information Patent Grant
1887141
- Patent number 1,887,141
- Issue date Nov 8, 1932
- F22 - STEAM GENERATION
Information Patent Grant
1882422
- Patent number 1,882,422
- Issue date Oct 11, 1932
- F22 - STEAM GENERATION
Information Patent Grant
1832064
- Patent number 1,832,064
- Issue date Nov 17, 1931
- F22 - STEAM GENERATION
Information Patent Grant
1753267
- Patent number 1,753,267
- Issue date Apr 8, 1930
- F22 - STEAM GENERATION
Information Patent Grant
1437495
- Patent number 1,437,495
- Issue date Dec 5, 1922
- F22 - STEAM GENERATION