# Relationship history for MSHA mine 4503530

Current hierarchy: **Steve  Herke; Mark  Herke → Herke Rock & Construction → Herke Quarry**

- 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:** Mark  Herke et al → Herke Quarry; 2002-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Herke Rock & Construction → Herke Quarry; 2003-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Herke et al → Herke Rock & Construction; 2003-02-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Herke et al → Herke Rock & Construction; 2003-02-12 to current/open; source msha-controller-operator-history