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| All Patents in class 901/21 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,212,649 | Oct. 19, 1965 | J. Walter, V. Milenkovic, H.T. Johnson | Machine for Performing Work | assembling machines | |
| 6,227,793 | May 08, 2001 | C.A. Knighten | Door transport system | specialty woodworking machines | |