# Relationship history for MSHA mine 4608743

Current hierarchy: **Wright Jeff → E Z Money Coal Company Inc → No 55 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

- **operator_operates_mine:** Rocky Road Coal Company Inc → No 55 Mine; 1998-10-01 to 2000-01-09; source msha-controller-operator-history
- **controller_controls_mine:** Killen Edmund & Lewis Spurrier → No 55 Mine; 1998-10-01 to 2000-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Killen Edmund & Lewis Spurrier → Rocky Road Coal Company Inc; 1998-10-01 to 2000-01-09; source msha-controller-operator-history
- **operator_operates_mine:** E Z Money Coal Company Inc → No 55 Mine; 2000-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wright Jeff → No 55 Mine; 2000-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wright Jeff → E Z Money Coal Company Inc; 2000-01-10 to current/open; source msha-controller-operator-history