# Relationship history for MSHA mine 0504366

Current hierarchy: **Redland Plc → Western-Mobile Northern Inc → Portable Plant #9**

- 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:** Redland Plc → Portable Plant #9; 1988-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western-Mobile Northern Inc → Portable Plant #9; 1988-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western-Mobile Northern Inc; 1988-07-01 to current/open; source msha-controller-operator-history