# Relationship history for MSHA mine 2003515

Current hierarchy: **Terri  Sparks → E.E. Sparks & Sons → E.E. Sparks & Sons**

- 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:** E.E. Sparks & Sons → E.E. Sparks & Sons; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Terri  Sparks → E.E. Sparks & Sons; 2015-10-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terri  Sparks → E.E. Sparks & Sons; 2015-10-26 to current/open; source msha-controller-operator-history