# Relationship history for MSHA mine 2901948

Current hierarchy: **Alonzo Aloysius(Bud)  Vance → Broce Construction Company Of Nm Inc → Vado 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

- **controller_controls_mine:** Alonzo Aloysius(Bud)  Vance → Vado Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Broce Construction Company Of Nm Inc → Vado Pit; 1983-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alonzo Aloysius(Bud)  Vance → Broce Construction Company Of Nm Inc; 1983-12-01 to current/open; source msha-controller-operator-history