# Relationship history for MSHA mine 0900087

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Southeast, Inc. → Hall County 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

- **operator_operates_mine:** Gainesville Limestone Products Inc → Hall County Quarry; 1950-01-01 to 1999-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Philyaw Terrell C → Hall County Quarry; 1950-01-01 to 1999-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Philyaw Terrell C → Gainesville Limestone Products Inc; 1950-01-01 to 1999-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Hall County Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Hall County Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates East Inc → Hall County Quarry; 1999-10-01 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates East Inc; 1999-10-01 to 2002-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Southeast, Inc. → Hall County Quarry; 2002-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Southeast, Inc.; 2002-02-01 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Hall County 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