# Relationship history for MSHA mine 3003517

Current hierarchy: **Norman E  Baker → Norman Baker & Sons → Baker 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:** Norman Baker & Sons → Baker Pit; 2005-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Norman E  Baker → Baker Pit; 2005-09-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Norman E  Baker → Norman Baker & Sons; 2005-09-14 to current/open; source msha-controller-operator-history