# Relationship history for MSHA mine 1507448

Current hierarchy: **Princess Cindy Mining Company → Princess Cindy Mining Company → No 1 Surface Mine**

- 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:** Princess Cindy Mining Company → No 1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Princess Cindy Mining Company → No 1 Surface Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Princess Cindy Mining Company → Princess Cindy Mining Company; 1950-01-01 to current/open; source msha-controller-operator-history