# Relationship history for MSHA mine 4406120

Current hierarchy: **Milburn Colliery Company → Locher Brick Works Inc → Tinsley Pit**

- 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:** Milburn Colliery Company → Tinsley Pit; 1979-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Locher Brick Works Inc → Tinsley Pit; 1984-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Milburn Colliery Company → Locher Brick Works Inc; 1984-08-01 to current/open; source msha-controller-operator-history