# Relationship history for MSHA mine 2302435

Current hierarchy: **William Evan  Ernst; Terry  Snelling → E and S Rock → Anstine 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

- **operator_operates_mine:** E and S Rock → Anstine Quarry; 2012-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** William Evan  Ernst et al → Anstine Quarry; 2012-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William Evan  Ernst et al → E and S Rock; 2012-05-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Terry  Snelling et al → E and S Rock; 2012-05-08 to current/open; source msha-controller-operator-history