E21C 25/02

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
8690261 Hydraulic resonant breaking hammerDec 31, 10Apr 08, 14Not available
8079647 Vibratory milling machine having linear reciprocating motionSep 18, 08Dec 20, 11LONGYEAR TM, INC.
6517164 Hammer-ripper excavating systemAug 07, 00Feb 11, 03Not available
5390983 Roadbed profiler and method of profilingJan 07, 94Feb 21, 95Inco Limited
5333937 Excavation machine having combined impact hammers and static ripper pickOct 14, 92Aug 02, 94Not available
5028092 Impact kerfing rock cutter and methodSep 28, 90Jul 02, 91RAMEX SYSTEMS, INC.