# Relationship history for MSHA mine 4202182

Current hierarchy: **Bryce  Christensen → Bryce Christensen Excavating Inc → BCX 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:** Bryce Christensen Excavating Inc → BCX Pit; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bryce  Christensen → BCX Pit; 1997-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bryce  Christensen → Bryce Christensen Excavating Inc; 1997-08-01 to current/open; source msha-controller-operator-history