# Relationship history for MSHA mine 0901008

Current hierarchy: **Jones Robert E → Southeastern Stone → Mashburn Stone**

- 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:** Mashburn Stone → Mashburn Stone; 1987-09-01 to 1989-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Mashburn Thomas R Jr → Mashburn Stone; 1987-09-01 to 1989-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Mashburn Thomas R Jr → Mashburn Stone; 1987-09-01 to 1989-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Southeastern Stone → Mashburn Stone; 1989-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones Robert E → Mashburn Stone; 1989-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Robert E → Southeastern Stone; 1989-01-30 to current/open; source msha-controller-operator-history