# Relationship history for MSHA mine 3401132

Current hierarchy: **Mc Neill Douglas M → Mc Neill Construction Inc → Bouse Junction Quarry**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Northwest Gypsum Inc → Bouse Junction Quarry; 1978-03-09 to 1989-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Wilbur P  Drake → Bouse Junction Quarry; 1978-03-09 to 1989-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Wilbur P  Drake → Northwest Gypsum Inc; 1978-03-09 to 1989-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Mc Neill Construction Inc → Bouse Junction Quarry; 1989-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Neill Douglas M → Bouse Junction Quarry; 1989-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Neill Douglas M → Mc Neill Construction Inc; 1989-11-16 to current/open; source msha-controller-operator-history