# Relationship history for MSHA mine 1510637

Current hierarchy: **Clevinger Gregory-Dennis & Ellis → Triple C Coal Company → #6 Mine**

- 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:** Nick A  Cooley et al → #6 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clevinger Gregory-Dennis & Ellis Et Al → #6 Mine; 1977-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hunts Branch Coal Company Inc → #6 Mine; 1977-08-01 to 1979-12-13; source msha-controller-operator-history
- **controller_controls_operator:** Nick A  Cooley et al → Hunts Branch Coal Company Inc; 1977-08-01 to 1979-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Triple C Coal Company → #6 Mine; 1979-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clevinger Gregory-Dennis & Ellis Et Al → Triple C Coal Company; 1979-12-14 to current/open; source msha-controller-operator-history