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n4science.
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isa:306436620
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The method of making a casing patch is described, including the steps of: positioning an annular member having an internal configuration of lands and grooves around the upper end of the casing; lowering a forging tool and a spear into the upper end of the casing; setting the spear into gripping engagement with the casing at a position above the forging tool; positioning a protective collar around
prov:wasQuotedFrom
n4:gov
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isap:91813116
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isa:306436620