# Relationship history for MSHA mine 4801686

Current hierarchy: **Brad J  Locke → B&M Sand and Gravel → B&M Sand and Gravel, Inc.**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** B&M Sand and Gravel → B&M Sand and Gravel, Inc.; 2006-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brad J  Locke → B&M Sand and Gravel, Inc.; 2006-02-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brad J  Locke → B&M Sand and Gravel; 2006-02-21 to current/open; source msha-controller-operator-history