# Relationship history for MSHA mine 4002809

Current hierarchy: **Campbell Jerry → Low Branch Coal Company → No 1 Mine**

- 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:** A & C Coal Company → No 1 Mine; 1982-10-01 to 1984-10-29; source msha-controller-operator-history
- **controller_controls_mine:** Ayers Ray → No 1 Mine; 1982-10-01 to 1984-10-29; source msha-controller-operator-history
- **controller_controls_operator:** Ayers Ray → A & C Coal Company; 1982-10-01 to 1984-10-29; source msha-controller-operator-history
- **operator_operates_mine:** Low Branch Coal Company → No 1 Mine; 1984-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Campbell Jerry → No 1 Mine; 1984-10-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Campbell Jerry → Low Branch Coal Company; 1984-10-30 to current/open; source msha-controller-operator-history