# Relationship history for MSHA mine 2103822

Current hierarchy: **Brent  Ervin → Ervin Construction → Chieftain 1400**

- 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:** Brent  Ervin → Chieftain 1400; 2000-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ervin Construction → Chieftain 1400; 2014-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent  Ervin → Ervin Construction; 2014-04-28 to current/open; source msha-controller-operator-history