# Relationship history for MSHA mine 4002762

Current hierarchy: **Bowlin W H → W H Bowlin Coal Company → Highcliff Tipple**

- 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:** Bowlin W H → Highcliff Tipple; 1976-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kaneb Services Inc → Highcliff Tipple; 1976-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mustang Coal Inc → Highcliff Tipple; 1981-12-01 to 1984-04-08; source msha-controller-operator-history
- **controller_controls_operator:** Kaneb Services Inc → Mustang Coal Inc; 1981-12-01 to 1984-04-08; source msha-controller-operator-history
- **operator_operates_mine:** W H Bowlin Coal Company → Highcliff Tipple; 1984-04-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bowlin W H → W H Bowlin Coal Company; 1984-04-09 to current/open; source msha-controller-operator-history