# Relationship history for MSHA mine 3800671

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Southeast Inc → Greenwood 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:** Hanson PLC → Greenwood Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Greenwood Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wilson Quarry Inc → Greenwood Quarry; 1994-08-01 to 1996-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Thomas W  Wilson → Greenwood Quarry; 1994-08-01 to 1996-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Thomas W  Wilson → Wilson Quarry Inc; 1994-08-01 to 1996-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Stewart H  Johnson → Greenwood Quarry; 1995-09-01 to 1999-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Morgan Corp → Greenwood Quarry; 1996-04-23 to 1999-08-02; source msha-controller-operator-history
- **controller_controls_operator:** Stewart H  Johnson → Morgan Corp; 1996-04-23 to 1999-08-02; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates East Inc → Greenwood Quarry; 1999-08-03 to 2001-09-12; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates East Inc; 1999-08-03 to 2001-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Southeast Inc → Greenwood Quarry; 2001-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Southeast Inc; 2001-09-13 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Greenwood Quarry; 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