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| All Patents in class 411/548 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,491,943 | Apr. 29, 1924 | J. Zilliox | Bolt Key | ||
| 3,696,412 | Oct. 03, 1972 | R.I. Swanson | Method and Means for Indicating Tension | ||