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| Patents for Constantin Hedrei | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,516,458 | Jun. 23, 1970 | C. Hedrei | Guides for twin blade saws | band sawmills | |
| 3,703,196 | Nov. 21, 1972 | C. Hedrei | System for controlling the setting of a quadruple band saw | band sawmills | |