# Relationship history for MSHA mine 1510780

Current hierarchy: **Kennie Ray  Childers → Kerri-Dawn Coal Company Inc → #2**

- 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:** Sigmon Harold A → #2; 1976-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mary Beth Coal Corp Inc → #2; 1977-09-01 to 1983-12-15; source msha-controller-operator-history
- **controller_controls_operator:** Sigmon Harold A → Mary Beth Coal Corp Inc; 1977-09-01 to 1983-12-15; source msha-controller-operator-history
- **controller_controls_mine:** Kennie Ray  Childers → #2; 1983-08-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kerri-Dawn Coal Company Inc → #2; 1983-12-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kennie Ray  Childers → Kerri-Dawn Coal Company Inc; 1983-12-16 to current/open; source msha-controller-operator-history