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| All Patents in class 174/138D | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 777,215 | Dec. 13, 1904 | C.R. Meston | Shaft-coupling | |
| 3,170,735 | Feb. 23, 1965 | H.H. Coffin | Insulated die set | ||
| 3,195,374 | Jul. 20, 1965 | H.H. Coffin | Method of making an electrically insulated joint | ||
 | 3,685,843 | Aug. 22, 1972 | A. Jacyno | Insulated chuck | |