# Relationship history for MSHA mine 3800121

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Southeast Inc → HASSKAMP SAND & GRAVEL**

- 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

- **operator_operates_mine:** Becker Sand & Gravel Company Inc → HASSKAMP SAND & GRAVEL; 1950-01-01 to 1986-02-27; source msha-controller-operator-history
- **controller_controls_mine:** J Chris  Swift → HASSKAMP SAND & GRAVEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Chris  Swift → Becker Sand & Gravel Company Inc; 1950-01-01 to 1986-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Becker Minerals Inc → HASSKAMP SAND & GRAVEL; 1986-02-28 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Alfred Mc Alpine Inc → HASSKAMP SAND & GRAVEL; 1986-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alfred Mc Alpine Inc → Becker Minerals Inc; 1986-02-28 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → HASSKAMP SAND & GRAVEL; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Southeast Inc → HASSKAMP SAND & GRAVEL; 1999-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Southeast Inc; 1999-04-12 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → HASSKAMP SAND & GRAVEL; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Southeast Inc; 2007-08-23 to current/open; source msha-controller-operator-history