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| All Patents in class 249/174 | |||||
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| Number | Date | Patentee | Title | Type | |
| 97,953 | Dec. 14, 1869 | C.B. Morse | Improvement in cast-steel tube or ingot | ||
| 235,796 | Dec. 21, 1880 | C.B. Morse | Mold and core for casting hollow ingots | foundryman | |
| 810,276 | Jan. 16, 1906 | J.B. Hill | Mold for Drain or Sewer Pipes | pipe molds | |