# Relationship history for MSHA mine 1517220

Current hierarchy: **CONSOL Energy Inc → Consol Of Kentucky Inc → Wiley Contour Mc**

- 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:** Hugh  Holbrook → Wiley Contour Mc; 1976-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Wiley Contour Mc; 1986-07-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holbrook Mining Company Inc → Wiley Contour Mc; 1992-04-01 to 1996-12-26; source msha-controller-operator-history
- **controller_controls_operator:** Hugh  Holbrook → Holbrook Mining Company Inc; 1992-04-01 to 1996-12-26; source msha-controller-operator-history
- **operator_operates_mine:** Consol Of Kentucky Inc → Wiley Contour Mc; 1996-12-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Consol Of Kentucky Inc; 1996-12-27 to current/open; source msha-controller-operator-history