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What does UBO stand for?

UBO stands for Underground Blasting Operations

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This definition appears very frequently

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Other Resources: Acronym Finder has 16 verified definitions for UBO

Samples in periodicals archive:

Underground Blasting Operations. Concerning cost effectiveness, the significance of blasting operations often is being disregarded. Applying the adequate blasting...
#167;5257. Makeup or Primer House for Underground Blasting Operations. (a) When 30 or more primers are required for a single round/shot...