GRADER BLADE
United States Patent 3431980
US Patent References:
Piston type vibrator
- - 3286534

Soil ripper
- - 3357498


Inventors:
Singer V Jr., Marshall
Publication Date:
03/11/1969
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Assignee:
Marshall V Jr., Singer
Primary Class:
172/40
International Classes:
A01B11/00; A01B35/04; A01B35/10
Foreign References:
IT580703B
CH334926A




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