# Relationship history for MSHA mine 3600625

Current hierarchy: **Brickworks Limited → Glen-Gery Corporation → Lower Heidelberg**

- 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:** Glen Gery Corp → Lower Heidelberg; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Glen-Gery Corp → Lower Heidelberg; 1950-01-01 to 1981-09-27; source msha-controller-operator-history
- **controller_controls_operator:** Glen-Gery Corp → Glen Gery Corp; 1950-01-01 to 1979-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ibstock Plc → Lower Heidelberg; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Glen-Gery Corp → Lower Heidelberg; 1980-01-01 to 1999-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Ibstock Plc → Glen-Gery Corp; 1980-01-01 to 1999-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Glen-Gery Corporation → Lower Heidelberg; 1999-05-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Lower Heidelberg; 1999-05-17 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Glen-Gery Corporation; 1999-05-17 to 2015-02-25; source msha-controller-operator-history
- **controller_controls_mine:** FIGGS BIDCO 2 LIMITED → Lower Heidelberg; 2015-02-26 to 2018-11-22; source msha-controller-operator-history
- **controller_controls_operator:** FIGGS BIDCO 2 LIMITED → Glen-Gery Corporation; 2015-02-26 to 2018-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Brickworks Limited → Lower Heidelberg; 2018-11-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brickworks Limited → Glen-Gery Corporation; 2018-11-23 to current/open; source msha-controller-operator-history