# Relationship history for MSHA mine 4605345

Current hierarchy: **Fitzpatrick Clyde → Coolridge Equipment & Mining Company → No 1 Surface**

- 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:** Lilly I C → No 1 Surface; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** G & I Coal Company Inc → No 1 Surface; 1977-02-01 to 1977-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Lilly I C → G & I Coal Company Inc; 1977-02-01 to 1977-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Coolridge Equipment & Mining Company → No 1 Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Fitzpatrick Clyde → No 1 Surface; 1977-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fitzpatrick Clyde → Coolridge Equipment & Mining Company; 1977-10-01 to current/open; source msha-controller-operator-history