# Relationship history for MSHA mine 4404516

Current hierarchy: **Duff Patton J → B R S Coal Company Inc → No 1 Strip**

- 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:** Duff Patton J → No 1 Strip; 1976-06-10 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B R S Coal Company Inc → No 1 Strip; 1976-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Duff Patton J → B R S Coal Company Inc; 1976-07-01 to current/open; source msha-controller-operator-history