# Relationship history for MSHA mine 1201712

Current hierarchy: **Bass J M Jr → Coal Inc → 4th Vein 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

- **controller_controls_mine:** Haas Paul D → 4th Vein Mine; 1977-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Inc → 4th Vein Mine; 1979-06-01 to 1985-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Haas Paul D → Coal Inc; 1979-06-01 to 1985-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Coal Inc → 4th Vein Mine; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bass J M Jr → 4th Vein Mine; 1985-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bass J M Jr → Coal Inc; 1985-09-12 to current/open; source msha-controller-operator-history