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| All Patents in class 29/216 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,236,826 | Aug. 14, 1917 | R.A. Durland | Valve Spring Compressor | valve spring tools | |
| RE14,640 | Apr. 29, 1919 | R.A. Durland | Valve Spring Compressor | valve spring tools | |