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Refractory raw materials rotary dryer patents

US3407511A US63888967A US3407511A US 3407511 A US3407511 A US 3407511A US 63888967 A US63888967 A US 63888967A US 3407511 A US3407511 A US 3407511A Authority US United States Prior art keywords drum flights aggregate dryer screen Prior art date 1967-05-16 Legal status (The legal status is an assumption and is not a legal conclusion

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