# Relationship history for MSHA mine 1401862

Current hierarchy: **Nic  Camello; Rich  Johnson; Storm  Johnson → Sunset Stone Co. → Sylvester 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:** Sunset Stone Co. → Sylvester Quarry; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Storm  Johnson et al → Sylvester Quarry; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Storm  Johnson et al → Sunset Stone Co.; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rich  Johnson et al → Sunset Stone Co.; 2026-08-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nic  Camello et al → Sunset Stone Co.; 2026-08-12 to current/open; source msha-controller-operator-history