# Relationship history for MSHA mine 3606621

Current hierarchy: **I G E Inc → Fenush Coal Company Inc → Fenush Strip #1**

- 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

- **operator_operates_mine:** C R Coal Company → Fenush Strip #1; 1978-03-01 to 1979-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Fenush Carl G & Francis R → Fenush Strip #1; 1978-03-01 to 1979-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Fenush Carl G & Francis R → C R Coal Company; 1978-03-01 to 1979-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Fenush Coal Company Inc → Fenush Strip #1; 1979-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** I G E Inc → Fenush Strip #1; 1979-01-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** I G E Inc → Fenush Coal Company Inc; 1979-01-19 to current/open; source msha-controller-operator-history