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| Patents for E21C 50 - Obtaining minerals from underwater, not otherwise provided for (408) |
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| 08/10/1976 | US3973575 Mining concentrator | | 08/03/1976 | US3972566 Solids concentrator | | 07/27/1976 | US3971593 Method of extraction of nodular sediments or the like from the sea floor and an installation for carrying | | 07/13/1976 | US3968579 Apparatus for sediment dredging and ocean mineral gathering | | 04/20/1976 | US3951457 Hydraulic mining technique for recovering bitumen from tar sand deposit | | 04/13/1976 | US3949883 Hydraulically operated heavy lift system for vertically moving a string of pipe | | 03/16/1976 | US3943868 Heave compensation apparatus for a marine mining vessel | | 03/16/1976 | US3943644 Mining dredge having endless bucket conveyor and flexible guide train |
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