![]() Original Assignee AMTEC DEV Co Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US06/067,156 Inventor Richard Maloblocki Current Assignee (The listed assignees may be inaccurate. Google Patents Pneumatic-hydraulic pump dredgeÄownload PDF Info Publication number US4307525A US4307525A US06/067,156 US6715679A US4307525A US 4307525 A US4307525 A US 4307525A US 6715679 A US6715679 A US 6715679A US 4307525 A US4307525 A US 4307525A Authority US United States Prior art keywords chamber air kelly bar dredging device pump Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US4307525A - Pneumatic-hydraulic pump dredge US4307525A - Pneumatic-hydraulic pump dredge ![]()
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