# Relationship history for MSHA mine 0201144

Current hierarchy: **DAVID M  DAY → Francis Day & Sons → Concho Pit**

- 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:** Francis Day & Sons → Concho Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DAVID M  DAY → Concho Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DAVID M  DAY → Francis Day & Sons; 1950-01-01 to current/open; source msha-controller-operator-history