# Relationship history for MSHA mine 1517760

Current hierarchy: **Henry  Chaney Jr → Cheyenne Elkhorn Coal Company Inc → #5**

- 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:** Henry  Chaney Jr → #5; 1976-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Childress Construction & Trucking → #5; 1996-03-01 to 1996-08-05; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Childress et al → #5; 1996-03-01 to 2000-11-29; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Childress et al → Childress Construction & Trucking; 1996-03-01 to 1996-08-05; source msha-controller-operator-history
- **operator_operates_mine:** Cheyenne Elkhorn Coal Company Inc → #5; 1996-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Henry  Chaney Jr → Cheyenne Elkhorn Coal Company Inc; 1996-08-06 to current/open; source msha-controller-operator-history