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| All Patents in class 138/131 | |||||
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| Number | Date | Patentee | Title | Type | |
| 571,869 | Nov. 24, 1896 | N. Stow | Flexible shaft | industrial machine mechanisms | |
| 2,266,226 | Dec. 16, 1941 | A.W. Mall | Flexible hose and method of manufacturing | handheld power sanders | |
| 2,266,227 | Dec. 16, 1941 | A.W. Mall | Flexible housing | ||