# Relationship history for MSHA mine 1511987

Current hierarchy: **Haney Allen D → H & H Mining Company → No 1 Surface 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** H & H Mining Company → No 1 Surface Mine (D); 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Haney Allen D → No 1 Surface Mine (D); 1979-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Haney Allen D → H & H Mining Company; 1979-08-01 to current/open; source msha-controller-operator-history