# Relationship history for MSHA mine 4503513

Current hierarchy: **Annmarie  Scholes → Washougal Basalt Rock Quarry LLC → Serenity Mine**

- 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:** A & B Rock Distributors LLC → Serenity Mine; 2002-08-06 to 2014-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Dan  Gustafson → Serenity Mine; 2002-08-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dan  Gustafson → A & B Rock Distributors LLC; 2002-08-06 to 2014-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Washougal Basalt Rock Quarry LLC → Serenity Mine; 2014-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Annmarie  Scholes → Serenity Mine; 2014-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Annmarie  Scholes → Washougal Basalt Rock Quarry LLC; 2014-06-01 to current/open; source msha-controller-operator-history