Title:
VIBRATORY CUTTING MEANS TO SUPPLEMENT EARTH PENETRATION AND MOVEMENT BY EARTH WORKING EQUIPMENT
United States Patent 3443327

Inventors:
Martin, William E.
Publication Date:
05/13/1969
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Assignee:
Martin, William E.
MARTIN CO
Primary Class:
37/412
Other Classes:
172/40
International Classes:
E02F3/40; E02F3/64; E02F3/76; E02F3/815; E02F3/46; E02F3/62; E02F3/76
Foreign References:
GB878807A




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