# Relationship history for MSHA mine 3602695

Current hierarchy: **Robert E  Murray → Energy Resources Inc → Energy Resources Inc**

- 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

- **operator_operates_mine:** Doan Coal Company → Energy Resources Inc; 1950-01-01 to 1982-09-27; source msha-controller-operator-history
- **controller_controls_mine:** David G  Doan → Energy Resources Inc; 1950-01-01 to 1982-09-27; source msha-controller-operator-history
- **controller_controls_operator:** David G  Doan → Doan Coal Company; 1950-01-01 to 1982-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Energy Resources Inc → Energy Resources Inc; 1982-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Energy Resources Inc; 1982-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Energy Resources Inc; 1982-09-28 to current/open; source msha-controller-operator-history