# Relationship history for MSHA mine 0403137

Current hierarchy: **Bailey J L → J L Bailey & Son → Bailey Pit & Mill**

- 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:** J L Bailey & Son → Bailey Pit & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bailey J L → Bailey Pit & Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bailey J L → J L Bailey & Son; 1950-01-01 to current/open; source msha-controller-operator-history