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| Patents Granted on 1970-05-05 | |||||
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| Number | Date | Patentee | Title | Type | |
| CA-840,686 | May 05, 1970 | J.C. Jones, E.D. Brennan | Grinding Machines | ||
| 3,509,667 | May 05, 1970 | K.L. Lindmark | Method of grinding welded rail | track maintenance machinery | |