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| All Patents in class 65/20 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,871,498 | Aug. 16, 1932 | I.J. Clark | Valve Lifter | valve spring tools | |
| RE19,414 | Jan. 08, 1935 | I.J. Clark | Valve Spring Compressor | valve spring tools | |