# Relationship history for MSHA mine 1511269

Current hierarchy: **Rose Alvin R & Sammie D → Triple M & K Coal Company → No 2 Mine (D)**

- 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:** Rose Alvin R & Sammie D → No 2 Mine (D); 1976-05-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Adams & Stalker Coal Company → No 2 Mine (D); 1978-05-01 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_mine:** Stalker Billy C & William B Adams → No 2 Mine (D); 1978-05-01 to 1981-08-10; source msha-controller-operator-history
- **controller_controls_operator:** Stalker Billy C & William B Adams → Adams & Stalker Coal Company; 1978-05-01 to 1981-08-10; source msha-controller-operator-history
- **operator_operates_mine:** Triple M & K Coal Company → No 2 Mine (D); 1981-08-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rose Alvin R & Sammie D → Triple M & K Coal Company; 1981-08-11 to current/open; source msha-controller-operator-history