# Relationship history for MSHA mine 0503787

Current hierarchy: **Bear William A → Bear Coal Company Inc → Bear #3 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Bear William A → Bear #3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bear Coal Company Inc → Bear #3 Mine; 1982-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bear William A → Bear Coal Company Inc; 1982-07-01 to current/open; source msha-controller-operator-history