# Relationship history for MSHA mine 4405191

Current hierarchy: **Mc Daries H C → H & B Coal Mining Company Inc → No 2 Strip**

- 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:** Mc Daries H C → No 2 Strip; 1976-10-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** H & B Coal Mining Company Inc → No 2 Strip; 1979-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Daries H C → H & B Coal Mining Company Inc; 1979-04-01 to current/open; source msha-controller-operator-history