# Relationship history for MSHA mine 4103795

Current hierarchy: **Gregory L Osterhout → Texastone Quarries → TEXASTONE QUARRIES LLC**

- 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:** Texastone Quarries → TEXASTONE QUARRIES LLC; 1993-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Brenda  Edwards → TEXASTONE QUARRIES LLC; 1993-12-01 to 2022-03-08; source msha-controller-operator-history
- **controller_controls_operator:** Brenda  Edwards → Texastone Quarries; 1993-12-01 to 2022-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Gregory L Osterhout → TEXASTONE QUARRIES LLC; 2022-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gregory L Osterhout → Texastone Quarries; 2022-03-09 to current/open; source msha-controller-operator-history