# Relationship history for MSHA mine 3610181

Current hierarchy: **Albaro  Altamirano Cortes → Cortes Stone → Cortes Stone**

- 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:** Marcy Stone → Cortes Stone; 2016-08-31 to 2020-12-13; source msha-controller-operator-history
- **controller_controls_mine:** Stephen G  Marcy → Cortes Stone; 2016-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Stephen G  Marcy → Marcy Stone; 2016-08-31 to 2020-12-13; source msha-controller-operator-history
- **operator_operates_mine:** Cortes Stone → Cortes Stone; 2020-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Albaro  Altamirano Cortes → Cortes Stone; 2020-12-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albaro  Altamirano Cortes → Cortes Stone; 2020-12-14 to current/open; source msha-controller-operator-history