# Relationship history for MSHA mine 4607577

Current hierarchy: **Jeffery Gary A → Tri-J Coal Company Inc → #2 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:** Jeffery Gary A → #2 Mine; 1979-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tri-J Coal Company Inc → #2 Mine; 1988-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jeffery Gary A → Tri-J Coal Company Inc; 1988-09-01 to current/open; source msha-controller-operator-history