# Relationship history for MSHA mine 3003250

Current hierarchy: **Elinor  Burch → Howard Burch Construction → HOWARD BURCH CONST.**

- 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:** Howard Burch Construction → HOWARD BURCH CONST.; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Elinor  Burch → HOWARD BURCH CONST.; 1998-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elinor  Burch → Howard Burch Construction; 1998-10-01 to current/open; source msha-controller-operator-history