# Relationship history for MSHA mine 4501252

Current hierarchy: **Hood Alice L → Coulee Concrete → COULEE CONCRETE 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

- **operator_operates_mine:** Coulee Concrete → COULEE CONCRETE PIT; 1950-01-01 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_mine:** Hood Leroy → COULEE CONCRETE PIT; 1950-01-01 to 1994-07-27; source msha-controller-operator-history
- **controller_controls_operator:** Hood Leroy → Coulee Concrete; 1950-01-01 to 1994-07-27; source msha-controller-operator-history
- **operator_operates_mine:** Coulee Concrete → COULEE CONCRETE PIT; 1994-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hood Alice L → COULEE CONCRETE PIT; 1994-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hood Alice L → Coulee Concrete; 1994-07-28 to current/open; source msha-controller-operator-history