# Relationship history for MSHA mine 1500167

Current hierarchy: **Wienerberger AG → General Shale Brick, Inc. → Coral Ridge**

- 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:** General Shale Products Corp → Coral Ridge; 1950-01-01 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_mine:** General Shale Products Corp → Coral Ridge; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** General Shale Products Corp → General Shale Products Corp; 1950-01-01 to 1986-06-29; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Products Corp → Coral Ridge; 1986-06-30 to 2001-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Marley Plc → Coral Ridge; 1986-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marley Plc → General Shale Products Corp; 1986-06-30 to 2001-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Coral Ridge; 1999-07-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Products LLC → Coral Ridge; 2001-08-13 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → General Shale Products LLC; 2001-08-13 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Wienerberger AG → Coral Ridge; 2002-07-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Brick, Inc. → Coral Ridge; 2004-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wienerberger AG → General Shale Brick, Inc.; 2004-07-01 to current/open; source msha-controller-operator-history