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Machine for Mixing and Injecting Water and Grout Into a Roof Bolt Hole.
U S Patent 1985 Feb;(4):
Note: abstracts are not available for patents at this time.
Issue of Publication
U.S. Patent No. 4,497,578, Feb. 5, 1985
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division