# Relationship history for MSHA mine 1400501

Current hierarchy: **CRH PLC → Apac-Kansas Inc → HUTCHINSON SAND PLANT**

- 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

- **controller_controls_mine:** Ashland Inc → HUTCHINSON SAND PLANT; 1950-01-01 to 2006-08-27; source msha-controller-operator-history
- **operator_operates_mine:** J H Shears' Sons Inc → HUTCHINSON SAND PLANT; 1950-01-01 to 1988-12-28; source msha-controller-operator-history
- **controller_controls_mine:** William  Shears Jr → HUTCHINSON SAND PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William  Shears Jr → J H Shears' Sons Inc; 1950-01-01 to 1988-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Shears Construction L P → HUTCHINSON SAND PLANT; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **controller_controls_mine:** Superfos America Inc → HUTCHINSON SAND PLANT; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **controller_controls_operator:** Superfos America Inc → Shears Construction L P; 1988-12-29 to 2000-02-21; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Kansas Inc → HUTCHINSON SAND PLANT; 2000-02-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Kansas Inc; 2000-02-22 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → HUTCHINSON SAND PLANT; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Apac-Kansas Inc; 2006-08-28 to current/open; source msha-controller-operator-history