# Relationship history for MSHA mine 1201635

Current hierarchy: **Albert William → D & P Inc → Regal Energies No 4 Strip**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** D & P Inc → Regal Energies No 4 Strip; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albert William → Regal Energies No 4 Strip; 1978-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert William → D & P Inc; 1978-04-01 to current/open; source msha-controller-operator-history