# Relationship history for MSHA mine 4607693

Current hierarchy: **Compton Lynn → Tri Energy Resources Inc → No 3**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Pittston Company → No 3; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Buffalo Mining Company → No 3; 1989-04-01 to 1990-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Buffalo Mining Company; 1989-04-01 to 1990-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Energy Resources Inc → No 3; 1990-09-10 to 1991-07-30; source msha-controller-operator-history
- **controller_controls_mine:** Herndon David N → No 3; 1990-09-10 to 1991-07-30; source msha-controller-operator-history
- **controller_controls_operator:** Herndon David N → Tri-Energy Resources Inc; 1990-09-10 to 1991-07-30; source msha-controller-operator-history
- **operator_operates_mine:** Tri Energy Resources Inc → No 3; 1991-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Compton Lynn → No 3; 1991-07-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Compton Lynn → Tri Energy Resources Inc; 1991-07-31 to current/open; source msha-controller-operator-history