# Relationship history for MSHA mine 4703044

Current hierarchy: **Willers Bruce E → B & D Services → Crusher #1**

- 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 & D Services → Crusher #1; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Willers Bruce E → Crusher #1; 1994-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Willers Bruce E → B & D Services; 1994-10-01 to current/open; source msha-controller-operator-history