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| Patents for Robert Collen | |||||
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| Number | Date | Patentee | Title | Type | |
| 606,516 | Jun. 28, 1898 | R. Collen | Machinery for manufacturing casks or barrels | barrel making machines | |
| 607,219 | Jul. 12, 1898 | R. Collen | Machine for manufacturing casks or barrels | barrel making machines | |