# Relationship history for MSHA mine 4800661

Current hierarchy: **Reeves J A → Columbine Mining Company → Rainbow No 8 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Lincoln Corporation → Rainbow No 8 Mine; 1970-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Gunn-Quealy Coal Company → Rainbow No 8 Mine; 1972-04-01 to 1975-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Lincoln Corporation → Gunn-Quealy Coal Company; 1972-04-01 to 1975-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Columbine Mining Company → Rainbow No 8 Mine; 1975-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Reeves J A → Rainbow No 8 Mine; 1975-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Reeves J A → Columbine Mining Company; 1975-06-24 to current/open; source msha-controller-operator-history