# Relationship history for MSHA mine 1515515

Current hierarchy: **Ellis Richard → Grit Coal Company Inc → No 1**

- 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

- **operator_operates_mine:** C T & S Mining Company Inc → No 1; 1986-01-01 to 1986-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Clifton Henry → No 1; 1986-01-01 to 1986-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Clifton Henry → C T & S Mining Company Inc; 1986-01-01 to 1986-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Grit Coal Company Inc → No 1; 1986-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ellis Richard → No 1; 1986-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ellis Richard → Grit Coal Company Inc; 1986-10-24 to current/open; source msha-controller-operator-history