# Relationship history for MSHA mine 3606272

Current hierarchy: **Browning James E-Edward & Rick → B B & B Strip → B B And B 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** B B & B Strip → B B And B Strip; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Browning James E-Edward & Rick → B B And B Strip; 1976-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Browning James E-Edward & Rick → B B & B Strip; 1976-11-01 to current/open; source msha-controller-operator-history