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| Patents for Harland H. Coffin | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,055,714 | Sep. 25, 1962 | H.H. Coffin | Die set bearing | tool and die maker | |
| 3,170,735 | Feb. 23, 1965 | H.H. Coffin | Insulated die set | tool and die maker | |
| 3,195,374 | Jul. 20, 1965 | H.H. Coffin | Method of making an electrically insulated joint | tool and die maker | |