# Relationship history for MSHA mine 1401525

Current hierarchy: **Hunt Midwest Enterprises → Hunt Midwest Mining Div Of KS → Lawrence 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

- **controller_controls_mine:** R B  Killough → Lawrence Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hunt Midwest Enterprises → Lawrence Quarry; 1985-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Killough Quarries Inc → Lawrence Quarry; 1989-05-01 to 1995-05-31; source msha-controller-operator-history
- **controller_controls_operator:** R B  Killough → Killough Quarries Inc; 1989-05-01 to 1995-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Hunt Midwest Mining Div Of KS → Lawrence Quarry; 1995-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hunt Midwest Enterprises → Hunt Midwest Mining Div Of KS; 1995-06-01 to current/open; source msha-controller-operator-history