# Relationship history for MSHA mine 4605619

Current hierarchy: **Somon Michael W → Ludee Enterprises Inc → Mine No 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:** Somon Coal Company → Mine No 1; 1977-09-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Somon John P → Mine No 1; 1977-09-01 to 1978-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Somon John P → Somon Coal Company; 1977-09-01 to 1978-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Ludee Enterprises Inc → Mine No 1; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Somon Michael W → Mine No 1; 1978-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Somon Michael W → Ludee Enterprises Inc; 1978-07-01 to current/open; source msha-controller-operator-history