# Relationship history for MSHA mine 1517993

Current hierarchy: **Henry  Chaney Jr → Cheyenne Elkhorn Coal Co Inc → #7**

- 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

- **controller_controls_mine:** Henry  Chaney Jr → #7; 1976-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Timmy  Ratliff et al → #7; 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** A & R Coal Corp → #7; 1997-10-01 to 1998-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Timmy  Ratliff et al → A & R Coal Corp; 1997-10-01 to 1998-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Dennis  Ratliff et al → A & R Coal Corp; 1997-10-01 to 1998-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Elkhorn Coal Co Inc → #7; 1998-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Chaney Jr → Cheyenne Elkhorn Coal Co Inc; 1998-10-15 to current/open; source msha-controller-operator-history