# Relationship history for MSHA mine 0401989

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Pacific Southwest Inc → Lakeside Sand & Processing**

- 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:** Nelson & Sloan → Lakeside Sand & Processing; 1950-01-01 to 1999-01-14; source msha-controller-operator-history
- **controller_controls_mine:** James  Nelson → Lakeside Sand & Processing; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Nelson → Nelson & Sloan; 1950-01-01 to 1999-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Lakeside Sand & Processing; 1987-05-01 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Pacific Southwest Inc → Lakeside Sand & Processing; 1999-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Pacific Southwest Inc; 1999-01-15 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Lakeside Sand & Processing; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Pacific Southwest Inc; 2007-08-23 to current/open; source msha-controller-operator-history