# Relationship history for MSHA mine 1201875

Current hierarchy: **Hartman John F → Jae-Eff Coal Inc → Brust 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Jae-Eff Coal Inc → Brust Mine; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hartman John F → Brust Mine; 1982-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hartman John F → Jae-Eff Coal Inc; 1982-01-01 to current/open; source msha-controller-operator-history