# Relationship history for MSHA mine 4405291

Current hierarchy: **Marley Plc → General Shale Products Corp → Richardson**

- 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:** General Shale Products Corp → Richardson; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Products Corp → Richardson; 1979-01-01 to 1986-06-29; source msha-controller-operator-history
- **controller_controls_operator:** General Shale Products Corp → General Shale Products Corp; 1979-01-01 to 1986-06-29; source msha-controller-operator-history
- **operator_operates_mine:** General Shale Products Corp → Richardson; 1986-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marley Plc → Richardson; 1986-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marley Plc → General Shale Products Corp; 1986-06-30 to current/open; source msha-controller-operator-history