# Relationship history for MSHA mine 2301826

Current hierarchy: **Ron  Beshears → B & B Sand & Gravel Inc → O'Brien Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Southwest Missouri Sand & Gravel → O'Brien Pit; 1980-06-01 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Mc Gaugh Fay → O'Brien Pit; 1980-06-01 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Mc Gaugh Fay → Southwest Missouri Sand & Gravel; 1980-06-01 to 1984-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Ron  Beshears → O'Brien Pit; 1980-11-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Missouri Sand & Gravel → O'Brien Pit; 1984-09-19 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Harper William G → O'Brien Pit; 1984-09-19 to 1987-04-27; source msha-controller-operator-history
- **controller_controls_operator:** Harper William G → Southwest Missouri Sand & Gravel; 1984-09-19 to 1987-04-27; source msha-controller-operator-history
- **operator_operates_mine:** B & B Sand & Gravel Inc → O'Brien Pit; 1987-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron  Beshears → B & B Sand & Gravel Inc; 1987-04-28 to current/open; source msha-controller-operator-history