# Relationship history for MSHA mine 1401316

Current hierarchy: **Clyde D  Miller → Miller Sand → Errington Sand 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:** Miller Brothers Construction Company Inc → Errington Sand Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Brothers Construction Company Inc → Errington Sand Pit; 1979-01-01 to 1979-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Miller Brothers Construction Company Inc → Miller Brothers Construction Company Inc; 1979-01-01 to 1979-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Miller Sand → Errington Sand Pit; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Clyde D  Miller → Errington Sand Pit; 1979-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clyde D  Miller → Miller Sand; 1979-11-01 to current/open; source msha-controller-operator-history