# Relationship history for MSHA mine 0405036

Current hierarchy: **Hanson PLC → Hanson Aggregates West Inc → IONE 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Hanson PLC → IONE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Santa Fe Pacific Corp → IONE PLANT; 1986-08-01 to 1993-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Cal West Rock Products Inc → IONE PLANT; 1989-05-01 to 1993-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Santa Fe Pacific Corp → Cal West Rock Products Inc; 1989-05-01 to 1993-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates West Inc → IONE PLANT; 1993-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates West Inc; 1993-07-27 to current/open; source msha-controller-operator-history