# Relationship history for MSHA mine 3503712

Current hierarchy: **David  Braxling → B & H Construction Inc → Thomas 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 & H Construction Inc → Thomas Pit; 2008-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Braxling → Thomas Pit; 2008-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Braxling → B & H Construction Inc; 2008-12-05 to current/open; source msha-controller-operator-history