Ground Support
Some means of support is required in order to maintain the stability of the openings that are excavated. This support comes in two forms, local support and area support.
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Famous quotes containing the words ground and/or support:
“The thing that made me more and more afraid
Was that we’d ground it sharp and hadn’t known,
And now were only wasting precious blade.”
—Robert Frost (1874–1963)
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—James Madison (1751–1836)