# Relationship history for MSHA mine 0900931

Current hierarchy: **B E  Bledsoe → Satilla Sand Company Inc → Rocky Creek Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Strickland John C → Rocky Creek Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Altamaha Sand Company Inc → Rocky Creek Plant; 1980-11-01 to 1982-12-27; source msha-controller-operator-history
- **controller_controls_operator:** Strickland John C → Altamaha Sand Company Inc; 1980-11-01 to 1982-12-27; source msha-controller-operator-history
- **operator_operates_mine:** Satilla Sand Company Inc → Rocky Creek Plant; 1982-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** B E  Bledsoe → Rocky Creek Plant; 1982-12-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** B E  Bledsoe → Satilla Sand Company Inc; 1982-12-28 to current/open; source msha-controller-operator-history