# Relationship history for MSHA mine 4002794

Current hierarchy: **Knox Tillman W → Hall & Knox Mining Company Inc → Maury County Operations**

- 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:** Knox Tillman W → Maury County Operations; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hall & Knox Mining Company Inc → Maury County Operations; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knox Tillman W → Hall & Knox Mining Company Inc; 1982-07-01 to current/open; source msha-controller-operator-history