# Relationship history for MSHA mine 3503756

Current hierarchy: **Gerald E  Briggs → B Rock Ready → Gazley 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:** B Rock Ready → Gazley Pit; 2011-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Gerald E  Briggs → Gazley Pit; 2011-01-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gerald E  Briggs → B Rock Ready; 2011-01-11 to current/open; source msha-controller-operator-history