Assignee

HOFFMAN MICHAEL R

US·2 granted patents·109 citations·filing 1989–1990

Technology mixA01B2 A01C2 E21B2 A63B1

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2 records

0183US4884638ASoil coring device with a core ejector mechanismHOFFMAN MICHAEL R·Filed 1989·Granted Dec 5, 1989·68 cites·8 claims
0263US4974682AHammer driven soil coring deviceHOFFMAN MICHAEL R·Filed 1990·Granted Dec 4, 1990·41 cites·6 claims

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