# Relationship history for MSHA mine 2301948

Current hierarchy: **Don E  LaBrayere → D & D Property → WRIGHT CITY 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Massey Excavation Inc → WRIGHT CITY QUARRY; 1986-02-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_mine:** Zykan James Jr → WRIGHT CITY QUARRY; 1986-02-01 to 1989-10-01; source msha-controller-operator-history
- **controller_controls_operator:** Zykan James Jr → Massey Excavation Inc; 1986-02-01 to 1989-10-01; source msha-controller-operator-history
- **operator_operates_mine:** Wright City Quarry Inc → WRIGHT CITY QUARRY; 1989-10-02 to 1992-11-30; source msha-controller-operator-history
- **controller_controls_mine:** John H Berra Construction Co → WRIGHT CITY QUARRY; 1989-10-02 to 1992-11-30; source msha-controller-operator-history
- **controller_controls_operator:** John H Berra Construction Co → Wright City Quarry Inc; 1989-10-02 to 1992-11-30; source msha-controller-operator-history
- **operator_operates_mine:** D & D Property → WRIGHT CITY QUARRY; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Don E  LaBrayere → WRIGHT CITY QUARRY; 1992-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Don E  LaBrayere → D & D Property; 1992-12-01 to current/open; source msha-controller-operator-history