# Relationship history for MSHA mine 4801523

Current hierarchy: **Toby  Servoss; V E  Boothby → Raven Quarries Llc → RAVEN 196**

- 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:** Sunrise Stone Inc → RAVEN 196; 1994-09-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Thomas  Ser Voss → RAVEN 196; 1994-09-01 to 1995-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Thomas  Ser Voss → Sunrise Stone Inc; 1994-09-01 to 1995-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Raven Quarries Llc → RAVEN 196; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** V E  Boothby et al → RAVEN 196; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** V E  Boothby et al → Raven Quarries Llc; 1996-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Toby  Servoss et al → Raven Quarries Llc; 1996-01-01 to current/open; source msha-controller-operator-history