# Relationship history for MSHA mine 0504437

Current hierarchy: **Rich Edward → Yellow Eagle Mining Inc → Box Creek 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

- **operator_operates_mine:** Box Creek Inc → Box Creek Mine; 1990-08-01 to 1991-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Burks Bill → Box Creek Mine; 1990-08-01 to 1991-10-04; source msha-controller-operator-history
- **controller_controls_operator:** Burks Bill → Box Creek Inc; 1990-08-01 to 1991-10-04; source msha-controller-operator-history
- **controller_controls_mine:** Rich Edward → Box Creek Mine; 1991-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Yellow Eagle Mining Inc → Box Creek Mine; 1991-10-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rich Edward → Yellow Eagle Mining Inc; 1991-10-05 to current/open; source msha-controller-operator-history