# Relationship history for MSHA mine 1516059

Current hierarchy: **Pilling Merle W-Lloyd Thomas Martin → Princess Five Inc → No 1 Preparation Area**

- 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:** Princess Five Inc → No 1 Preparation Area; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pilling Merle W-Lloyd Thomas Martin Et Al → No 1 Preparation Area; 1987-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pilling Merle W-Lloyd Thomas Martin Et Al → Princess Five Inc; 1987-06-01 to current/open; source msha-controller-operator-history